You adjust weight on them just like on any other compound. Tighten the limb bolts right for more poundage. Loosen them for less poundage. Only extra thing about Hoyts is the locking screws under the limb butts. Two on the top limb bracket and two on the bottom. Loosen them up so you can make your adjustment and tighten them back down when you're done.

If you didn't get an owner's manual with your bow, here's the link to read it online. It's all explained in there.

http://www.hoyt.com/assets/downloads/manuals/08_Compound_manual.pdf