do you have phpMyadmin installed? If not, that would be a good first start.

once you have that installed, you can log in to phpMyadmin and access the database for Wordpress. Find the table called “wp-options” and look for the site_url option. Make sure that matches what you want.

You might also scroll through and find the option named “front_page” and change that as well.

After you have made those changes, be sure to refresh your browser and try to log in to Wordpress (Hold down shift while reloading page..which will clear your cache and reload the page fresh)