Looking for a Xamarin Forum using vs2017

I am attempting to create the first sample in VS2017 using Xamarin form.  Is their a Xamarin forum to get help.

I need help with the first Xamarin sample form.

Instruction NEXT, CREATE AN EMPTY LIST THAT CAN BE FILLED WITH PHONE NUMBERS.  THE MAINACTIVITY CLASS WILL LOOK LIKE THIS:

The sample code given below.   Where do I insert this code below:

translationHistoryButton.Click += (sender, e) =>
{
var intent = new Intent(this, typeof(TranslationHistoryActivity));
intent.PutStringArrayListExtra("phone_numbers", phoneNumbers);
StartActivity(intent);
};