I am getting error when logged in access to index.php

I have given all permission to the user I am trying to logged in with but whenever the user gets logged in but this message is showing up:You do not have permission to access /mywebsite/index.php.Back to login pageBut also the menu is showing nothing.

Make sure that current user has been assigned to your desired User Level, and try again.

Thank you !!!How and where can I do that ?

For static user level permission, check Security → Advanced → User Levels → Static User Levels. Lookup the permission for the specific user level.For dynamic user level permission, you need to login to the generated web site as hard code admin, click User Level and then select permission for the specific user level.