To double space in Wordpad, do the following:
1) Highlight (select) all of your text. You can do this quickly by pressing CTRL+A
2) Press CTRL+2
This will double space all the text you have...
First, highlight everything that you want to be in 1.5 spacing. Then, press cntrl and 5 and the same time. To undo, press cntrl and 1 at the same time. Good luck!