This action will usually be performed after you have copied content to the clipboard.  

To paste text into document:

1. Click the location that you want to paste text to. If you want to paste over existing text, highlight that text first.

2. Click the 'Edit' option from the menu bar at the top of the editor window.  A drop-down menu will appear.

3. Click 'PASTE' to paste the clipboard contents into the document.

Alternatively, if the button is available you can click it to paste.