Can anyone tell me where is the "wireless switch" on the comp?

That is a bit too cryptic Party, definitely need more info please.

Lomaca, trying to set up a new pocket wi-fi, keeps going round in circles and at one point suggests "ensure that wireless switch is on"

If I plug the thing into the comp though, I have access? make any sense?

Sure does, it's asking you to turn on your wireless router-switch or if it's on let have access to it.

Do you have a wireless router or one that only connects to your computer via cable??

Router that would be your modem connecting to your ISP!

PS easy to check, does it have a little antenna sticking out?

Well, its either or, at the mo. it's connected via a cable as that's the only way I can be on the net,............. if I unplug it, that's it! disconnected? but there is no visible antenna on it

and yes that has a switch on the side which is ON.