To change your own display name
1. Tap the settings icon > Profile > Display Name.
2. Enter the display name you want to change to, then tap Save.
To change a friend's display name
1. Tap the friend you wish to change the name from the friends list.
2. Tap the pencil icon from the pop-up.
3. Enter the name and tap Save.
To change your profile photo
1. Tap the settings icon > Profile.
2. Tap the image on the top left, then select the upload options.
3. Trim the photo if necessary, then tap OK.
Please note you are not able to change your friends' photos.
Let us know if we can make it better.