Assuming you are using a Helipal RTF. The switches that are important are the two switches on the right of the radio that are three position.
All switches can be forward and should be there for learning in my opinion. You should NOT go to manual mode if you are new (or even experienced - this is not an acrobatic platform) - ATTI and GPS are why we all like these machines. Manual mode is not activated on my machine so I doubt it is on yours - if you were in either of the two bottom positions, you were in ATTI.
Go to GPS (right three position switch forward/down), give it time to lock onto satellites, and enjoy. If you screw up and don't wait for the satellites, then GPS will be unstable but will probably still work - I've flown with 5 satellites before - if you manage to get it airborne without waiting for the flashing greens, then switch to ATTI and it will still work. But wait for GPS - it only takes a minute for the NAZA to find them. You won't have a fly-away because you went to GPS as long as you follow the rules. You will probably have crashes if you don't go to GPS - especially when you are first learning. Crashes can be expensive.
All the active switches are called out in the F550 manual that Helipal provides (if you got it from Helipal). Go to the F550 RTF page and download or read the manual. It explains it.
http://image.helipal.com/helipal-f550-r ... ual-01.pdf
More: Make sure the compass is calibrated. The manual shows you how and there are probably a zillion YouTube videos for Phantom that show you how (Phantom and F550 RTF are the same). You have to do the compass dance if you want GPS to work right.
Also, you should probably hook up to the NAZA with the PC assistant (download from DJI - runs on a Windows PC) and make sure you have the latest firmware. I had current NAZA stuff but my iOSD was out-of-date.