I can't seem to get RF transmitter and receiver working

Hi @daniu13,

welcome to the arduino-Forum.

You have taken the effort to write down a pretty detailed description of what you have done and a link what source you used.

You are working on an informatic project and in an informatic project is most needed guess what?
Information.

Still much more information is needed for effectivly helping you.

It might well be that you added a single character that changed the code to be not working
and this is the reason why you should really post your code

If I would say "remove line 547 from your code"

Will this work? Surely not because without seeing this line of code this make really no sense.

post complete sketches

Post your complete sketches. From the very first to the very last line.
There is a shortcut with which this can be done with a few mouse-clicks and keypresses
It is described here

best regards Stefan