Admin Problem (Add Plugin and Edit Themes)

Hello,
I’m trying to resolve a small problem for days.
Initially i couldn’t edit themes, so i changed permissions, i checked all boxex to make it work.
After that i tried to add themes and they requested password (i find a solution for that

//*added ftp login credentials to avoid <u>WordPress asking for FTP details</u> every time I wanted to upgrade a plugin*
define(‘FTP_HOST’, ‘host’);
define(‘FTP_USER’, ‘user’);
define(‘FTP_PASS’, ‘passw’);

But now i found out the root of the problems, i haven’t admin acces to wordpress. All in one SEO tells my i should be an admin to edit settings, and it seems i’m not.

I’m the only user on wordpress. I check all permissions at username in cpanel database. I tried to reinstall several times. ( when i tried not to rename config-sample, but to edit from wp-admin/setup-config.php it said wordpress cannot edit/create file.

Any ideas?
Thanks for your time.