I have one more question how to do change these on the main screen
![enter image description here][ATTACHMENT:6461]
[ATTACHMENT:6461]: https://www.opensource-socialnetwork.org/photoattachment/6461/circle.jpg![enter image description here][ATTACHMENT:6462]
If I understand what you need, edit the themes/goblue/plugins/default/css/core/default.php file and add this on body selector. According to the github file, it's at the top of the file.
background-image: url('https://facesplash.net/themes/goblue/images/background.jpg'); background-repeat: no-repeat; background-attachment: fixed; background-position: center;
I do this modification on browser developer tools on demo OSSN and the result is:
I found that one is there a way i can put a background image after you log in like the wallpaper behind the main page like where the Status box and stuff in after they log in