see here, it should help. if not, say so. there are also tons of resources on the net that you can find on this topic. going through it step by step here is really reinventing the wheel. try googling "how to graph a parabola" or something like that. that's what i searched for to find this site.
attached you will find a graph of . it is not a graph that you are allowed to say, "i can't graph that." it is really something you should know by heart, and can produce at will in a few seconds.