"I set it up like it said in the manual then changed the ip adress like it said on a difrent website but my internet still says that the internet may not be available"
I've set up quite a few range extenders and I've never seen instructions to change IP address - - never had to do that.
So I've an inkling that could be your problem -- start over and just follow instructions supplied with the extender, not "from a different website".
By the way, there's a better alternative to using a range extender in some situations (they are rubbish anyway, don't use them any more) and that's to use powerline adapters which provide an ethernet port. I use a pair for my smart TV and they are brilliant - - - no confusing configuration...