|Range extenders don't normally work 'out-of-the-box' because you need to enter the security password that you (hopefully) already have set up on your router and then add another password to the range extender.|
30 feet isn't a great distance and I would have thought your main router would have been able to handle this with no problem, so I suspect it's the signal from your main router that you are still picking up, not the extender.
Does your Blu-ray player have built-in wireless, or are you using their annoying, over-priced USB dongle?
If your blu-ray player has a socket for a network cable then you will be far better off ditching the extender and getting a couple of mains 'homeplug' - type network adapters, you will get a much better bandwidth.
Lastly, if you want to stick with the extender you can download the manual for it from the Linksys website.
"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd