Hi Coverman3,
I understand you're looking to connect your Deskjet 3520 with your Mac running 10.6.8 using a wireless router. I will certainly do my best to assist you in getting this set up.
I would suggest before doing any of the steps below I would suggest restoring the network defaults on the printer (Page 7 under How do I?) to make sure that everything is ready for the installation.
To set this printer up on your wireless network you need to use the USB cable and the software CD that came with the printer. You'll want to connect the printer to the Mac and then insert the software CD. The software will essentially do all of the work for you, just follow along with the prompts.
Hope this helps, have a great day!