Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
Normally, the notification should be cleared if you’re using Rank Math to handle your site’s SEO needs without other SEO plugins activated on your site.
If it’s not going away on your website after ensuring that, it is possible that there is some other problem causing the notification to be stuck there. For initial troubleshooting, clear your website’s cache and head over to Rank Math > Status & Tools > Database Tools > and click the Remove Transients button:

Please note that some options are only available when you enable the Advanced Mode in Rank Math. If it’s not showing, you must have chosen to use Easy Mode. Please follow the steps in this link to switch to Advanced Mode:
https://rankmath.com/kb/advanced-mode/
And since I installed Rank Math, I have an error message when I try to edit a page.
For this issue, could you please share the error message you are getting so we can check and advise accordingly?
Looking forward to helping you.
Thank you.
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.