If it works well enough to draw the map but you cannot make a turn, that is surprising... it should start as follows:
(1) show a help screen in which you can click "start game"
(2) show the initial map -- hovering over that map should move the green "+" sign and change the description below (if you are over something known)
(3) clicking on a friend of the blue gamer should move the "@" to there
Clicking on a small gray circle (initially, almost all gamers) does nothing (since you do not know how to reach there yet), I guess there should be some comment for clarity. If it is indeed broken, the browser console might contain some hints to help fix the issue.