WSIY957

Ok I'm very much a nubie, but I have a question that might seem dumb but here goes. I have a baofeng GM 15 Pro and I'm going through the menu and came across something called DIY I have no idea what it is or what to do with it. Please help, I think this could be a great hobby and I want to do things write and make some new friends along the way. I thank you all in advance for your time and wisdom. WSYI957,Piggl3t