when i try to log in from my site , it redirected me from my site again.

when I try to log in from my site , it redirects me to my site like I didn't log in. I use to use pa-zaz.com/login-php. when I used that it redirect me to my site to log in again. when I use pa-zaz.com/wp-admin, after I log in, I go directly to the back of the site. I use to use the first log in (login-php). any help with this situation?pls advise