To edit your Rapchat profile picture:
Tap the three-line menu in the top-right corner of your profile page
Tap “edit profile”
You can change your profile image, location, username, display name, as well as connect your social media accounts and website
NOTE: changing the artist name on your Rapchat profile (in profile settings) does NOT change your artist name for Distro.
If you want to update the image on your artist profile for any store where your song is distributed you will need to claim your artist account and update the image directly on those platforms. Learn how to do that here.