To add an image as your avatar please:
Navigate to your profile page
Tap the Camera icon on your profile picture
Choose to select a picture from your Gallery or take a new picture with your camera
Once you have saved your profile picture, Tango doesn't have an option to delete it without replacing with the new one.
To replace an existing profile picture please:
Navigate to your profile page
Click on your existing profile picture
Choosing a new one from the Gallery
As an alternative, you may go to the app settings and choose the tab "Edit Profile".
The option to edit a photo can also be found there.
Please remember that the photos that you post on your page need to follow The Guidelines. Photos that contain a violation will be subject for deletion and the account may face penalties.