You then put the QD (quick detach) mount anywhere on the front Saint handguard. It fits into the slots on the handguard via unique screws included that lock it into the slot.
you can put the qd mount on either side, bottom, up front or towards the back of the handguard. Most prefer up front like a traditional rifle sling.
buy a sling with QD ends and attach back of sling to the stock or right behind the grip. Saint victor has both built in. Whichever you prefer.
Then attach front of sling to the QD mount you attached