How can Margins be moved?
I started typing a letter and after a few lines, I wanted to move both margins a little closer to the edge of the document. I tried to click and drag the blue indicators in the ruler since this seemed like the intuitive Apple way to do it, and it wouldn't respond. Even clicking on command or control when clicking and dragging did not work. I went to the "Help" section and could not find anything on setting margins or tabs. Spaces between tabs, yes, but nothing on moving Margins. Thanks for your help.
iMac (27-inch Mid 2011), OS X Yosemite (10.10)