Select which airline's reward program you want to join and go to the airline's website. Locate the link to its rewards program on the home page. For instance, at delta.com, you will find a link to "Skymiles Login." Click that link to proceed.
Click on the prompt to begin your enrollment. For instance, for Delta's Skymiles program, you will see the question "Not a Skymiles member yet?" Click on "Learn more ..." to proceed to the next step.
Complete all the required fields. Usually, you need to provide your name, email address, phone numbers, and physical mailing address. You will also need to create a Personal Identification Number (PIN), so choose one that you will remember easily or store it wherever you keep other passwords.
Review all your entries to ensure they are accurate. Make any necessary corrections and then locate the button or prompt to continue to the next screen. Usually, the button or prompt will be the word "Continue" or "Next." Click on the prompt.
Print and/or wait to receive your card in the mail. Depending on the airline you have chosen, you may have an instant image of your enrollment number and membership card to print out or will have to wait for one sent by mail.