Makes sense on the post.

Here's what I did. Set up an account in the shop under my name. When I get ready for coupons, emails, etc., i always send one to myself first to proofread and make sure it is working correctly. Then, I send to the masses.

By setting up the test account you can see what your customer will see. As I recall, the coupon is a random number thing that you copy and paste into the coupon field on checkout. You might want to do it step-by-step yourself and then write a little guide to include with the coupon email.

good luck.