* Make sure there's a page there, then circle around a few times in the same direction, a maybe 1-2 cm radius.

* Make sure you are in the right browser. Mistyping pages gets you a page signed MicroB

* Make sure you circle more than once, it's a bit slow to trigger

* Moar details, like the post above(lancewex). Does your page scroll? Drag around? Maybe you are in mouse mode?