Thanks for pointing me in the right direction.
Note that you also have to...
1. show ruler (Format > Text > Show ruler)
2. select all of the text on the page (my first attempt only set tabs on the first line)
3. then you can set the tabs
Is there a way to set the position without the mouse? It's a bit hard for me to drag the mouse to an exact hundredth of an inch.
However, it looks like I won't need to do it again. After setting them, I created a new file and my new tabs are already there.
Thanks again. This really helped!