Installing 1389 Forearm, need some help.

Got a package from Crosman today, two new parts for the 1322. Installing the LPA MIM was about the easiest job possible, so naturally I would be dumbfounded when it came time to look at the new forearm. There were no instructions of any kind so I did a search and found you guys talking about pivot pins. Safe to say, I know nothing about this sort of thing. Are there any diagrams I can look at to show what I need to do here? I did see in one thread that one member's forearm came with the linkage, mine did not. Just the forearm itself, nothing else.

Thanks in advance for the help.

The gun so far:
Brand new 1322
1399 Stock
Crosman Steel Breech
LPA MIM rear sight

Waiting to be installed:
1389 forearm
Red trigger shoe by Dave Rose
Blue Fork black sighted barrel band (hopefully arriving in a day or two)

Once all this is done, I'll enjoy it for a while before doing the internal mods. It's a sweet shooter so far, I know I'll have plenty of fun with it.