In order to add a spell, go to your coven page and click on the hyperlink that says ''SpellBooks: View''
Then you should see the following:
____ currently has:
** Spells (View)
** Rituals (View)
** Videos (View)
In this case, you said you wanted to add a spell. So, click on the 'View' next to spells. Once you have done so, in the top right of your screen you should see a tab which says 'ADD SPELL'.
However, if you are a newbie, I don't recommend you add spells until you gather more experience in case they may mislead others.