How do i give groups their own special image?

For Example: Admin How do i give all admins a little picture saying Admin just above their avatar? Like how do i get the picture i upload it and whenver ppl see the person they know their admin because of the picture.

ty Answer plz

Administration Panel -> Users & Groups -> Rank Administration -> create admin group and go to modify, Rank Image URL and put the uploaded url or the ones provided.

~Uber Lord

k ty.