Admin Access

Yes another Newbi with a question. Have spent hours trying different ways to get into the admin / WP admin toolbar / administration screen so that I can upload a new theme.

I moved my URL from one host to Dream Host as it would run WP better and I could have a WP theme to transfer my pretty rubbish website to , this was all done very quickly and I can get into my Dream Host site no problem, however when I try to get into WP and especially admin it just goes straight to my website which was built on another server / package and transfered to dream host.

I have tried https://yoursite.com/wp-login.php
https://yoursite.com/wp-admin and various other combinations but to no avail.

I can go to www.remarpro.com and log in to view my profile but thats it.

What on earth am I doing wrong ? am I being completely stupid here.

Also when I signed up, the email had the following link https://www.mysite/wp-admin/install.php
I click on this link and it takes me straight to my web site, which is all well and good but not what I want to do. Need to get into admin to change the theme.

Any help would be great.

Thanks