Usually all you need is to add
/admin to your website address, it should redirect you to
/index.php?open=login (you can go there directly)
Additionally you can use
ESC keyboard shortcut.
The other most common way is to log into your Web Host Pro account and click the website to edit in the Web Builder widget.
If your website address is
www.YOUR-WEBSITE-ADDRESS.com try to visit
www.YOUR-WEBSITE-ADDRESS.com/admin - login options should be available there and by default "login with PIN" will be possible: enter your email address, which you have saved in website's configuration and system will send PIN code there - all you have to do is copy/paste this code to login. System should remember you for some time, but when you have to login again, you'll be asked for new PIN code.