

Move down to "weapon cache" and select it.

While in a crib, you'll see "Press (button) to access crib interface." Pressing that button brings up a menu. For instance, you can't take two pistol-class weapons at once. Each slot on the wheel can only hold one weapon at a time, and the slots are only for specific weapons.

From there it's just a matter of navigating the menu and selecting a new weapon from the weapon wheel. When you're in a crib or weapon shop, the game will show you which button to press. Cribs show up as house icons on the radar, and weapon stores show up like handgun icons. You can do this from your crib interface, or from any weapon store.
