Val, I would think that most of your graphics software would have that option. If not in there, look into your printer settings. Mine has a 'check off' box for reverse for iron-on printing.
Steve C.

That's too funny............I just found this yesterday as it pertains to scrapbooking!! Hope it helps.....it will if you have Microsoft Word!
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Microsoft Word

When you are creating this type of lettering in Word - you are actually drawing; so the first thing you want to do is to bring up the "drawing toolbar". To do this, select "view" from the top menu, from this dropdown down menu, click on "toolbars", then select "drawing". This will bring up the drawing toolbar on the bottom of your screen.

Select: In the center of the drawing toolbar - there is a blue, slanted "A" - this will bring up your WordArt. You may also bring up WordArt by choosing Insert (from the top toolbar), selecting "picture" from the dropdown menu, where WordArt is one of the options. When you first bring up WordArt - you will be asked to select a style. The default style (in the top left corner) is a simple outline, which is what we want. Press "ok" to continue.

Edit: You are now able to edit your WordArt text. Type in your title and change the font to whatever you wish. You can also change the size, but you can change the size easily at an time in the future. Press "ok" to continue. Finalize Placement: Your title will be transferred to your document. You may change the size just as you would any graphic by pulling at the corners. You can increase/decrease the size in general, or only in one direction (making it taller, wider, etc.) You will want to move your graphic from the center to a corner of the page to conserve paper when printing.

Flip: To reverse the lettering, bring up the drawing toolbar by clicking on the "draw" tab in the drawing toolbar (bottom left corner). Select the "Rotate or Flip" option, giving you the choice to "Flip horizontal" - Your graphic should now be a mirror image.

Print: If you are working with printed papers, make sure you put the paper in the printer so that the printing will be on the wrong side of the paper - when you cut the letters out, the correct direction will be on the printed side, while any stray printing lines will be unseen on the back. You may also want to select the "economy-fast" option (under your printer properties) during printing to conserve ink.

Hi -- Most newer version Graphics Programs have a Mirror feature which will reverse your text for printing on Tshirts. - Michele

Picking the paper reversed my image - thanks Steve!
Val