I cannot access plugins module

are u sure u are logging in with superadmin?

Is there anything that I need to enter in the db in order to make my current admin user to become super admin or network admin? What and where exactly should I insert or modify?

Thank you ??

Dear webdesignerchristian,
you gave me a good direction to research. You were right. My user was not network admin. I had to create (manually, directly in the database) another user that has network admin privileges/permissions.

Here is the solution:
https://www.wpbeginner.com/wp-tutorials/how-to-add-an-admin-user-to-the-wordpress-database-via-mysql/
And, at last, I had to add my new user in the “wp_sitemeta” table, in the “site_admins” field. This is my entry there:
a:1:{i:0;s:5:”test1″;}

I cleaned the cookies and refreshed and logged-in with the new user “test1”. It is OK now.
Thank you very much!

Kind greetings,
Ivan

You are welcome Mr Ivan. ?? please mark this thread resolved.