Path problem after changing servers

I have moved server;

My blog was previously at https://www.well-of-dreams.com/blog, but is now at https://blog.well-of-dreams.com.

The blog keeps looking for all its files and links at https://www.well-of-dreams.com/blog, and I can’t access /wp-admin/options-general.php to change it because it keeps trying to find the page at /blog, even if I type the whole url in.

I dont know what to do! x_x