If you're having trouble getting your theme to properly activate (you add the activation code but it still shows the "not activated" message), follow these steps to resolve the issue:
- Double check to make sure your activation code is entered correctly.
One of the most common mistakes people make is copying a blank space before the activation code. When pasted in to the form, it looks correct, but that leading space will cause your activation to fail.
- Disable any caching plugins.
Some hosting companies install a caching plugin by default with WordPress. This can cause problems with the activation code -- if you visit your site's homepage before activating the theme, the "not activated" message gets cached and will continue to show up until the cache expires. These plugins all let you manually clear the cache -- do that, disable the plugin, then enter the activation code.
- Make sure your activation code is saving.
After you enter the code make sure you hit the save button. Some users forget this step. Also, after hitting the save button, verify that the code appears in the input box when you open up the Activation Settings tab. If it doesn't, it's likely a configuration issue with your web host. If you contact them and let them know that your WordPress installation is having difficulty saving WP options, they should be able to fix the problem.
If the above all fail, file a support ticket that includes your website URL and a WordPress username and password. We'll try to resolve the issue for you as soon as possible.