Hello and thank you for contacting us. I will address your issues one by one.
1) I created a coupon, (there are no editing capabilities once created...)
Once you create a coupon, you can edit the coupon to alter the details. If you are having issues editing the plugin, please contact our technical support team via our support page for Coupon Code Plugin
2) It was to go to the the affiliated website...so it only shows a blank image...no verbage, with print me under it..
The image should not be blank unless you have used white on white. You should add information about the coupon code to the post or page you added the shortcode to.
The "print me" you mention is not part of our plugin and is likely part of your sharing options.
When clicking on the coupon code, it will open the affiliate link and take you to the affiliate link you used for that coupon code.
3) When I clicked on the print me (set to open in new window)...I got the same page...no coupon in site...
As mentioned in #2, the print me option is not part of our plugin and you should consult with the dev for that option should you wish to use it for coupons. We would need to know how the option worked so that we could see how you wanted it to work and run some tests.