Gradient question

Hi!
I use PS CS and I was trying to follow a tutorial that at some point says:

add a black and white gradient layer. layer > new fill layer > gradient > ok > pick the bnw one 

The problem I'm experiencing is that when I go to "new fill layer" the option "gradient" is not clickable. I've tried to touch a bit here and there, but it doesn't change :( I also don't have a black and white gradient in my presets to use on a new empty layer as an alternative... any ideas on how to quickly make one by myself or where shall I find it?

Thanks a lot in advance :)