Is it necessary that i register my Phantom 3 standard, i already have an account on DJI. If it's necessary where exact van i do it?

You can use your DJI account that you already have to log in the DJI GO app, DJI store and other DJI related platforms.

I actually have a DJI account and my Go app will not activate my Phantom 3 Standard. All it does is hang/freeze on the Confirm Your Activated Account screen when I hit the Activate button. Totally sucks as the only thing that happens after that is a force quit and no info on why the error is happening. Phone is a Nexus 5 with latest Android 6 so that shouldn't be an issue. I also have a Nexus 7 tablet with Android 6 and it does exactly the same thing. Suffice to say I have a fancy looking paperweight since this thing is comparable to a rock as far as flying ability goes.