ok thanks again Jan ... the Epson is now on the list and printing well. I did reset the Mac printing system - right click /reset printers and it deleted the epson. went through the + printer and it found the Epson again. not the Oki.
The oki is an MC362DN and looking on the actual printer itself it says Air Print enabled. when I google latest firmware it says if the model is not listed its not supported and mine is not on the list.
looking through the options on the actual machine I found the scan destination to be 1 IP address, the Network another IP address and then there is a Gateway address as well (different to both of these) .... do I need to do anything with these ?
the IP address on my Mac for the network matches the number for the scan destination (on the machine).
sorry, after awhile so many things are done, downloaded, redone it gets confusing PLUS the real technicalities get away from me. appreciate your help (as always)