touch 0 / touch 1 refer to simultaneous touching, thus, when two touches are detected simultaneously, touch 0 is the first one and touch 1 the second.
According to your description you want the first touch/tap to show info and the second to start a level. You could create an instance variable, showingInfo on the example below, to check for the first touch.
On Lv1Switch touched
if Lv1Switch.showingInfo = false [show info & set showingInfo to true]
Else [start the level]
Hope this help. Cheers!