1. To add the Form button  to the Quick Access Toolbar, do the following:
   1. Click the arrow next to the Quick Access Toolbar, and then click More Commands.
   2. In the Choose commands from box, click All Commands, and then select the Form button  in the list.
   3. Click Add, and then click OK.
2. On the Quick Access Toolbar, click Form .

Read more on how to use Data Form in MS Excel:

http://office.microsoft.com/en-us/excel-help/add-edit-find-and-delete-rows-by-using-a-data-form-HP010236698.aspx