Can't connect HP Photosmart C7280 wirelessly

Hi there,

Yesterday I purchased my first ever iMac (OS X 10.9.4 - Mavericks I believe).

I'm trying to connect my HP Photosmart C7280 printer to work wirelessly but can't seem to work out how to do it.

When I connect via a USB the printer is recognised in Printers & Scanners, when I remove the USB the printer disappears.

My Mac and printer are both connected to the same wireless network (which we get through Virgin Media) - although my printer displays "no link" for IP address, don't know if this is relevant.

I have tried resetting print system, I have downloaded all Apple system updates, I have downloaded the latest driver I could find from the HP site (although this might have been unnecessary).

One factor that may be significant is that when I view the printer details (when connected via USB) I see the Mac's name, the printer model and the status but I don't see any reference to a Driver, which from what I've read, I feel I should be seeing.

I've also read reference to clicking "use" in a drop-down menu but from the details I see in the printer pane/dialogue box? I cannot see "use" anywhere or any other drop-down menus.

Hope I've explained the situation adequately, I'm only mildly computer literate and have exhausted the extent of my knowledge!

Any help gratefully received - by the way, the printer always worked perfectly well wirelessly when connected to a Windows laptop on the same network,

thanks very much.