I was using membership bulk edit function and accidentally

I was using membership bulk edit function and accidentally edit my admin account setting - then I lost all the admin control including posting etc. I don't know what I did next then I was logged out by my own wordpress site. I cannot access the site by using same admin password (even I tried to reset the password by emails or even php control panel) and now I got only one subscriber account which I can log in. But I am not an expert to this and don't know how I could access this website again.

Godaddy support said I got a "custom" login function that caused the automate login function disabled. So they can't help me and I need to look for answers myself unless I want to reset the whole wordpress site which I don't want to...

Please help! Thanks.