To edit your email address and password on Bluprint from the full site, log into your account and click on the round account icon in the upper right-hand part of your screen. Next, click "Personal Information." Be sure to save after making changes!
If you are on the Bluprint mobile site, click on the three horizontal lines in the upper left corner of the screen. Next click on "Profile" and "Personal Information." From there, you can update your email address and password.
The Bluprint app does not currently have the ability to edit personal information. When you go into your account in the app you will see the option to Manage Subscription, this will link you to the mobile site to make those changes. In the app, it will look like this page here: