Show us a pic of the switch.
If it is the one with 6km/h this is a walk along mode don't try and ride the bike with it as it is not designed for this.
+/- buttons are for increasing assist level from low to high.
Each level will differ depending on if it is speed to torque simulation control. If speed control each of the three levels will be a different speed which you will notice.
If torque simulation the speed will be much the same but you will feel more oomph/torque from the drive in a different way to speed.
Yes, it's the only switchIs this the only switch on the bike or is there a display as well ?
The function you describe and posted up a pic to is different form the model they were selling, maybe it is an older incarnation of the same bike.The first position is off ie no electric assistance
Yes I've been riding it in the second position E , which I'm assuming is ok? Not sure what the third position A is?Does the bike work at all ?
Make sure the battery is charged check the battery output terminals with a volt meter,plac eit on the bike and make sure the battery is on if it has a switch.
move the switch to E & and pedal to see if it works, it has a pedal sensor and is a pas/cadence operated bike.
Does it have a throttle ?