Assuming that you mean the 'Insert' key on the keyboard, normally found somewhere up in the top right area of the keyboard.
This is used to switch back and forth between what are called 'Insert Mode' and 'Replace Mode'. Each time this key is pressed the computer switches from the mode it is in to the other one.
If you are typing a document and click in the middle of a word then type letters - in Insert mode the letters you type are inserted between the existing letters of the word - making the word longer - in Replace mode each letter you type will replace the letter to the right of the cursor keeping the word the same length.
The exact function may change depending on the software you are using, normal text editing software such as Microsoft Word, Word Perfect, Notepad etc all work as described - but the answers.com answer editor (used for this) does not - it always works in Insert Mode, I suspect that all internet based text editors work like this.
It is a tab on the ribbon in Office 2007 that lists various options for inserting objects into your document.
test paper
Use the Insert tab and select from the Charts section.
The "Insert" tab.
Insert Tab
Insert Tab | Media Group
tab bottom on key board
ctrl
CTRL
Go to the Insert menu and click on Worksheet or right click on a sheet tab and you can insert a worksheet. You can then drag it into a position before an existing worksheet.Go to the Insert menu and click on Worksheet or right click on a sheet tab and you can insert a worksheet. You can then drag it into a position before an existing worksheet.Go to the Insert menu and click on Worksheet or right click on a sheet tab and you can insert a worksheet. You can then drag it into a position before an existing worksheet.Go to the Insert menu and click on Worksheet or right click on a sheet tab and you can insert a worksheet. You can then drag it into a position before an existing worksheet.Go to the Insert menu and click on Worksheet or right click on a sheet tab and you can insert a worksheet. You can then drag it into a position before an existing worksheet.Go to the Insert menu and click on Worksheet or right click on a sheet tab and you can insert a worksheet. You can then drag it into a position before an existing worksheet.Go to the Insert menu and click on Worksheet or right click on a sheet tab and you can insert a worksheet. You can then drag it into a position before an existing worksheet.Go to the Insert menu and click on Worksheet or right click on a sheet tab and you can insert a worksheet. You can then drag it into a position before an existing worksheet.Go to the Insert menu and click on Worksheet or right click on a sheet tab and you can insert a worksheet. You can then drag it into a position before an existing worksheet.Go to the Insert menu and click on Worksheet or right click on a sheet tab and you can insert a worksheet. You can then drag it into a position before an existing worksheet.Go to the Insert menu and click on Worksheet or right click on a sheet tab and you can insert a worksheet. You can then drag it into a position before an existing worksheet.
The "References" ribbon tab is used to insert a citation in Microsoft Word. You can find options for adding citations and managing your source list within this tab.
ribbon tab is compost of home, insert,page layout etc.
Equal
On the Insert tab.