Fix Drupal website errors after domain change

We moved our Drupal website from moureys.com to garmentbuddy.com. However some of the functions such as signing in, adding items to cart, and various other functions cause the website to go back to the old moureys.com domain. I would need someone who is an expert in Drupal to go through the website and make sure no links or actions cause the website to revert back to moureys.com.