Firstly, with the fonts, when you click on the 'change font color' button, hold the button down and about a second later a menu will pop up with the color chart. With the mouse button still held down, move the cursor over the color you want and let go. Presto!
Same with the highlight, except to turn off highlighting, have the cursor over the 'no fill' button instead (in the highlighting popup menu)
For the margins, click on "Format" (on the menu bar) then click "Page", that will bring up a properties box. On the bottom left hand corner of that box is the 'margins' options. I think you know what to do from there