How on iOS do I select the option to 'invite friends' where is it located exactly? I can't seem to find it...wall me the answer would you kindly please.
Honestly, at your size... don't mess with sdt except if doing EEs. You are just starting to grow and you haven't lots of allies (nothing to lose in a strip).
Keep those volaries, you can always swap them later on with a day's gold earnings.
You can agree to a 1v1 beforehand or some players will do so if you start hitting them. Some will not. No specific system to engage a duel like that though.