Hold down the alt key and then press the enter key. This will allow you to write an extra line of text inside the same cell as is currently being used. This can be done as many times as required. When you are done, simply press the enter key to continue.
In order to have more than one line of text within a single cell of an Excel spreadsheet, do the following:
1. ) Either single click within the cell or within the formula bar at the point you want to start a new line. 2. ) Simultaneously press the "alt" and "enter" keys.
To force a carriage return, you must have the input text area selected (the area to the top, there should be a blinking cursor in there), and only then do you hit shift-enter (holding down shift while you tap enter).