ok I have read through this whole thread and many others on this subject and I do not understand how to get this to work. Like this part

"(0. make a backup of the original files! ^^)
1. place a picture with 60x60 in /usr/share/rtcom-messaging-ui/html/ named "avatar.png"
2. replace the three files (html, css, js) in the same folder with my modded files"

How do i make the backup?? this is not clear. All I wanna do is simply make it so there are 2 avatars in the messages inbox, why is it so hard!?