Do I need to give the app permission to use my location?

To use the full functionality yes.

How do I take a square?

You need be physically located in the square then press the flag button. This button is located at the base of the map screen.

What happens when I run out of flags?

Wait 5 minutes and you’ll get a free one. A counter will show during this time.¬†Another free flag gets added every 5 minutes until you have 10.

If you can’t wait you can buy more by¬† clicking on the flag with a plus sign.

How do I protect land I have already grabbed?

You can always add more flags to squares you own.

What’s the most effective way to use flags?

If you own adjacent squares, increasing the flags in one square will also increase those in the adjacent squares by the same amount.