How to assign weapons to F1-F4

I've started a warrior who sometimes wants to switch to a bow to pull. I can't figure out how to assign the bow to F2. The only bucket I see at the lower right is the F1 bucket.

How do I assign weapon/shield combos to F2-F4?

Open your inventory. There's a button there with the name "Weapon Sets". Click it and another window will pop up with "Weapon Set 2" "Weapon Set 3" and "Weapon Set 4". Click the corresponding boxes for them to appear.

Now, assuming you've clicked Weapon Set 2, hit F2 to switch to it. As it will be empty, click and drag or just double click the weapon or weapons you want to put in there.

Ok goto your characters inventory there should be a thing below where the shiled or secondary weapon is held called "WEAPON SETS" there you go click on that and if your weapon sets thing is enable in your menu you should be able to create new weapon sets

Thanks, much appreciated.