Go to the expedia.com website and click the membership login. This will be found at the top of the screen towards the right-hand side. Although you are not a member, you will be shown an options page.
Click the option titled "Create a new user account." A screen will show the form to complete to become a member. Fill in the name, e-mail, and password information. In addition to your normal membership Expedia offers a rewards program, review the terms and check the box next to the rewards program logo if you would like to join.
Review the overall terms and conditions for the regular membership program and check the box next to them. Click on the box labeled "Create Expedia Account." Your account will be created and automatically sign you in. From here you have access to your member page and information.