Wireless router installation

My daughter got an Android tablet for Christmas, so I needed to install a wireless router so she could access the internet, etc. Today I installed a Belkin Surf N 300 router, previously I was just using my broadband modem. After installation, I now can't stay connected to the internet, my connection is extremely slow when I am connected. I can't play any videos from places like youtube, I can't play backgammon on pogo games like I did previously, won't load, boots, errors, etc. When I installed the router, it pretty much installed itself, and I don't really understand the millions of settings it has, etc. So I just don't have a clue as to what to do. I read the manual online, but am still lost. Thanks for any help!!

 

ok...checked for firmware updates..it states its up to date. Reset to factory settings, and now it took me over 5 minutes to get in here to respond. My daughter is having difficulty with youtube, and yes the internet is slow and/or losing connection for her as well.

It is a Belkin Surf N300 Wireless N Router there does not appear to be a model number on the box anywhere.