How do you make a hybrid in RuneScape

there is no such thing as a "hybrid" in runescape, you might be thinking of World Of Warcraft.
-----------------------------------------------------------------------------------------------------------------
Wrong. The first person who answered this question is a complete idiot. Hybrids are PKers who have mage along with melee and or range with them. The point of a hybrid is to raise the following skills (not all the skills you can raise, just at least these ones to make it a "hybrid"): attack, strength, range, mage
Note that you can also get prayer and defence (BUT NOT TOO HIGH OF A DEFENCE LEVEL, I suggest leaving it as 1, or quest your defence so you may get 45 defence with barrows gloves -called berserker pure-) The point of a hybrid is to alternate attack styles, depending on the situation. You freeze them with ice burst/blitz/or barrage, then switch to range (to take down his HP faster), and then onto melee for the KO. If needed, you freeze him again with the spells mentioned earlier.

Hybrids are mainly made for P2P, not F2P. F2P hybrids aren't often made/used, because there's really no good freezing spell for mage and no super KO weapon for range and melee. To "make" a hybrid, I highly suggest you become a member. Good luck.