New text typed automatically starts at end of existing text already in cell.

Hello, 

I have some cells that already have random text in them. For a number of these, I need to randomly add more text, to the end of the existing text that's already in the cell. And I do this now by, selecting the cell, and then clicking at the end of the existing text, and then typing the new text. Is there a shortcut key that would automatically move the cursor, to the end of the existing text, so the first key I type, starts at the end of the existing text?