hi, UMIT OZAYDIN ,  for example, 

1,Event,

studio/builder_page.php?type=bx_events&page=bx_events_view_profile

click "Settings", find "cove", upload your picture change it.

2,for "Group"：

/studio/builder_page.php?type=bx_groups&page=bx_groups_view_profile

click "Settings", find "cove", upload and change it.

......

other module like this.