Step 1
Register new account on our support forum: https://support.cththemes.com/wp-login.php?action=register
You need to use Envato’s purchase code to verify purchase then complete the registration process.

Step 2
Login with your account then select purchased theme’s forum on the right sidebar to enter that item page.
For example: if you purchased CityBook – Directory & Listing WordPress Theme , find and select CityBook – Directory & Listing WordPress Theme forum as shown in the image below.

Then use editor at the end of the forum page to create new topic:

Notice: It’s theme-based support forum. You cannot purchase another item to claim support for the other item. So please make sure that you are posting topic on right theme forum.
Thank you.