wrodpress backdoor log in not working

I have installed wordpress using ftp (filezilla) and used byet host as a hosting company. For some reason I am not being able to start my login process though the admin log in.

Whenever I go to : https://www.mywebsite.com/wp-admin
it just takes me to my normal dash board. what do I have to do to make it work?

can anyone out there with the same issue help me?