Hello, we apologize for the issue you are facing. It seems like you are having trouble finding the option to register more websites. Unfortunately, the context provided does not contain specific information about this feature.
We recommend replying to your ticket with more details about your issue, and a human agent from the Rank Math Support team will assist you further. Thank you for raising this concern!
Hello,
Thank you for your query and we are so sorry about the trouble this must have caused.
You can disconnect your account by navigating to WordPress Dashboard > Rank Math > Dashboard > Help
and then simply disconnect the account by clicking on Disconnect Account.

Once you’ve disconnected your Rank Math account, you can connect it again in the same settings. In order to connect your correct account, click on Connect Now.

Once you click on Connect Now, please ensure that you’ve selected the correct account and then click on OK, Activate Now, as shown below.

After that, you can see all your connected sites here: https://rankmath.com/my-account/websites/
Please do not hesitate to let us know if this doesn’t help or you have any follow-up queries.