Please see the additional pictures from this website. It should help you figure how to set up your new sling.
http://www.rhinoairsoft.com/details....47-OD-A&cat=39
As you can see the fat padded part should rest on your non shouldering shoulder.
The attachment buckle to your AEG should rest in front of your chest.
While the adjustment buckle for tightness of the sling should rest underneath your shooting arm against the body.