Green pool help how do i fix it?

GREEN POOL Help HOW DO I FIX IT?
SO I'M having a pool party for my birthday well at least I want to but it's been green for about 3 months now. My family doesn't have ALOT of money considering that their buying me an IPhone for my birthday but I just want to know how much will it cost to get the pool fixed because I don't want to have to keep from the iPhone which is $200 but I really want a party and I really want to have it with safe chemicals since other people children are entering but yeah I just wanna know how much the chlorine and other stuff will cost All TOGETHER and I've been told that it'll be $200 dollars all together so… Yeah please help

Is this a built in pool. You must run the pool pump/filter to keep the water circulating or it is just going to be stagnant ditch water. You need to put pool shock in to kill the algae. Go to a local pool supply store and tell them what kind of pool you have and they will tell you what to do.

Do not swim in green water or you will get sick