Welcome! A few things to help get you started:
1 - You need a proper test kit. We recommend either a TF-100 (link below) or Taylor K-2006C, That's step 1.
2 - Post those results and we'll help you.
3 - Read our Pool School page (left menu) and/or read & save those Vital Links below in my signature. (Update yours as well).
It all starts there. We'll help you all the way, but you must have a proper test kit and do a little reading to understand what we're saying. Have a nice evening.