To log into the app, you need to create your credentials first. Once you purchase the app, you receive a verification to your email. It lets you set your password.
If you missed this email, make sure you're checking the right address if you have several. We suggest taking a look at the Spam and Promotion folders too, in case the letter ended up there by mistake. You can also add this subject line to your email search: "Your Beyond Body app purchase was confirmed!"
Once you set your credentials, follow these simple steps to start using the app: