As stated above you must be council position or higher to post spells. Higher being a priest or priestess. The easiest thing to do is go to the group tab, look for Spell Casters and hit join. You will auto join and automatically be set to council. But you can also join a lot of other covens as well. Even ones that do not give you council rank simply say to message them the spell you want posted or put it in the proper coven forum and they will post it for you crediting you.