Erro 403

Hello GoodMoring .
After updating the permissions on my user, he returned an error "403 Forbidden", "You cannot access this page." I use only one user, which is what I changed, I use the akaunting system, in the free hosting itself, but now I don't know how to solve this error, and I can't even access to perform a Backup.

Hello,

From phpMyAdmin, you will be going to your database and then when you change the user roles you can log in again.

Thank You