Below is a short description about each button.

Save icon Save your work and send it to yourself via email.
New Document icon Clear all of your work and start with a new document.
Load Bio Template icon Clear all of your work and load a new bio template, read more about this function in the Load bio template section.
Load Existing Bio (HTML) icon Clear all of your work and load your existing bio HTML code, read more about this function in the Load existing bio (HTML) section.
Bold text icon Bold text style (Ctrl+B).
Italic text icon Italic text style (Ctrl+I).
Underline text icon. Underline text style (Ctrl+U).
Strikethrough text icon. Strikethrough text style.
Align left icon. Align left.
Align center icon. Align center.
Align right icon. Align right.
Align full icon. Align full.
Insert Slideshow icon. Insert Image Slideshow, read more about this function in the Insert image slideshow section.
Insert Countdown icon. Insert Wedding Date Countdown, read more about this function in the Insert countdown section.
Insert Flash icon. Insert Flash item.
Cut icon. Cut (remove) the selected item (Ctrl+X).
Copy icon. Copy the current selected item (Ctrl+C).
Paste icon. Paste the most recent item from the clipboard into the current location (Ctrl+V).
Paste Text icon. Paste the most recent item from the clipboard into the current location as plain text
(this will loose any formatting from the source, and match the text to the existing destination format).
Paste Word icon. Paste the most recent item from the clipboard into the current location and maintain the source format
(this is used when pasting items from Word that have already been formatted the way you want).
Search icon. Search the document for the given text.
Replace icon. Search the document for the given text and replace it with something new.
Unordered list/bullet list icon. Unordered list/bullet list.
Ordered list/numbered list icon. Ordered list/numbered list
Outdent/decrease indentation icon. Outdent/decrease indentation.
Indent/increase indentation icon. Indent/increase indentation.
Undo the last operation. Undo the last operation (Ctrl+Z).
Redo the last operation icon. Redo the last operation (Ctrl+Y).
Insert a new link icon. Makes the current selection into a link, read more about this function in the Insert link section.
Unlinks the current selection icon. Unlinks the current selection/removes all selected links.
Insert a new anchor icon. Insert a new anchor, read more about this function in the Insert anchor section.
Insert a new image icon. Insert a new image, read more about this function in the Insert image section.
Cleanup code icon. Cleanup code/Removes unwanted formatting. This function is useful when you copy contents from for example a office product.
Show help icon. Shows this help window.
Source code editor icon. Opens HTML source code editor - recommended only for advanced users.
Preview icon. Opens a Preview of your Bio in a new window.
Forecolor icon. Edits the color of the selected text, read more about this function in the Color selection section.
Insert table icon. Inserts a new table at the current location, read more about this function in the Insert/Modify Table section.
Modify table icon. Modifies the existing table at the current location, read more about this function in the Insert/Modify Table section.
Cell Properties icon. Modifies the existing table cell at the current location, read more about this function in the Modify Table Cell section.
Adds a row above icon. Adds a row above the current one.
Adds a row under icon. Adds a row under the current one.
Remove row icon. Removes the row.
Add column before icon. Adds a column before the current one.
Add column after icon. Adds a column after the current one.
Remove column icon. Removes the current column.
Insert horizontal ruler icon. Inserts a new horizontal ruler
Remove formatting icon. Removes formatting from the selection.
Subscript icon. Makes the selection into a subscript.
Superscript icon. Makes the selection into a superscripted.
Insert Custom Character icon. Inserts a Custom Character at the current location.
Emotions icon. Inserts a smiley (or other type of expression) at the current location.
Edit HR icon. Edits the current selected horizontal ruler.
Print icon. Prints the document.