1.  Check that code is set up correctly
         - Go to Control > Code Library > Discount Codes
         - Click Edit and see if the code is set up properly (Ensure the right code is being used - these are case sensitive: example CE5 cannot be entered on the front end using ce5)

2.  Go to the Event or Form where the Discount Code is enabled
a. Go to Communities > Special Events > Friends Asking Friends > Kintera Thon
b. Hover over the event and click Website Info
c. Click Fee Structure
d. Click Discount next to the Registration Type the code was set up for and verify it is created
 
Make corrections as appropriate and re-test the Discount Code.  After making any changes, ensure you go back to the Webinfo Checklist and click Publish This Event Now for changes to take effect.