Hello, we apologize for the issue you are facing with finding the theme editor file. If you are unable to locate the Theme File Editor under Appearance, it might be due to the type of theme you are using.
For Classic Themes, you should find it under Appearance → Theme File Editor. For Block Themes, it is located under Tools → Theme File Editor.
If you still cannot find it, please ensure that you have the necessary permissions to access these settings or check if your theme supports this feature.
If you need further assistance, please reply to this ticket, and a human agent from the Rank Math Support team will overtake the ticket and assist you further.
Sources:
How to Easily Use PHP Code on Your Website » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.