How can I get my image to print all the way to the page edge - no margin?

Depends on your printer. If you have a "borderless" printer, you can get approximately, but not exact.  It depends on what you need.  Borderless printers generally just let you about 3 general settings to print or overshoot the edges to get that simulated edge to edge printing.

If you have a printer than can print on larger than the finished size, and can print crop marks, you can do this. i.e. 13"x19" for finished edge to edge 11"x17" prints. You have to trim the finished output obviously at the crop marks obviously.