How to set margins in a textedit file?

This only works if you want to make the margins greater that 1.25". I can't seem to make the margins any smaller, say 0.75".

I know the control key, option key,command key. Explain what "right click" is. On the lower right side of the keyboard are 4 keys: up↑, left◀, right▶, and down↓. You say "right click".Do you mean push the right key I just described?

First, be sure you are in Rich Text mode. If you aren't then change that in the Format menu of TextEdit. You will see the ruler above the page:

You create margins, indents, etc. using the settings in the toolbar.

The T gadget sets the left margin. The downward pointing arrow on the far right sets the right margin. The other arrow gadgets set tabs and can be set for left and right tabs as well as decimal tabs. CTRL- or RIGHT-click on the tab gadget to set it.

Never mind. I got it.