HELLO, I HAVE THE DJI GO APP INSTALLED ON MY PHONE BUT I CAN'T GET THE PHANTOM 3 STANDARD ON THE SCREEN TO CONNECT IT TO MY PHONE. PLEASE HELP IF POSSIBLE. THANKS.

First of all, you've posted your question in the Phantom 4 section. You will get more help if you post in the appropriate section for your aircraft. Second, there's no need to type in caps.
Have you installed the DJI GO or DJI GO 4 app? For P3S you need the DJI GO, NOT DJI GO 4. Assuming you have the correct app, you need to select your aircraft type from the first page that pops up, there is a drop down list somewhere that shows different types of aircraft, P3S will be one of them, select it & follow on screen instructions. If you have done all this already & still have no connection then you are either following the instructions wrong & haven't connected to the P3S wi-fi or you need to relink your aircraft with your RC.