You should have a page on there called Status- it varies where to find this info from brand to brand. Just click around the tabs and you will find it eventually 9no worries about harming anything that way eiither). All of the information you will need should be on this page regarding the DNS servers and Subnet mask. The router IP is the same IP you use to access the set up page.
You may want to try setting up a specific IP address for the router to give the PS3 every time it wants online. This can be done in DHCP on most routers or the DMZ. You will be needing the PS3's MAC Address, which can be found under System Information in the Settings menu on the PS3.
I think i may have to do up a quick how-to for setting up this sort of thing- seems like a lot of people having troubles.