Hi. Thanks for the note of appreciation. I know you said you do not wish to continue and want to be sure you will not be charged. As I understand it, you will only be charged if you "accept" an answer.
And the reason I say "as I understand it", JustAnswer/Pearl is the company. The "experts" like myself are not employees. We're just people that use the JustAnswer service like yourself. If you accept our answers, we make a little money.
So anyway, I'm just explaining that so you understand where I'm coming from. But I'm a "nerd" and thus am truly curious as to how you were able to finally connect to your printer. I'm invested in this problem and don't really care about getting paid or not. I just want to help you get it working if you still want to try. :)
So now that you were able to get your printer connected to your wireless, does it finally show up in your printer list on your Mac Air? If so, then selecting it should be all you have to do.
When you say you tried to put the IP address in the "location", was that on the printer or on your Mac Air?
Also, what is the IP address printed on your network configuration page from your printer?