Updating your uplines is easy! On the website, click on your name on the top right corner and select Profile link. This is will take you to your Profile Page. Select the Professional Profile Tab to update your level and your uplines and your professional contact info.
Updating your profiles on the mobile app is easy as well. Just tap on your profile pic at the top left of the screen, after you click this icon:
You can then search for and select your uplines from your profile screen.