valvecover leak

my mom has an 88 maxima and its leaking out the top does anyone know how to chang the valvecover seel i think its cracked any help is apriciated

I did both my valve covers, they were pretty easy, although the back one was a bit tricky to take off and put on. Make sure when you buy the gasket that you get the kit that includes the grommets. The set is like $20 a piece. If you get a Haynes Repair manual, the steps are in there.