You can easily customize your profile picture in your account in the My Wardrobe. section.
IOS App
Open the menu on the right side.
Select My Wardrobe.
Here you will find the Edit button in the top right corner.
After clicking Edit you can add a new profile picture or delete your current profile picture.
Android App
Open the menu on the left side.
Select My Wardrobe.
Here you will find the button Edit below your username.
After clicking on Edit the area opens where you can upload a new photo. Just use the pencil icon on the right side.
Website
Click on the user icon to the right of the Prelved logo.
Select My account.
Under My Data you will find the section My Closet. There you can upload your new profile picture. Please make sure not to use any copyrighted images.