Creating Gradients...?

My friend was using PS the other day, and he went into something that allowed him to create his own gradient and choose the colours and the points where the colours change.
Any idea how to do this?

I also use PS 7.

Thanks in advance :)

PS: I've figured out how to do it, but now the gradients won't save. When I click "load gradients" and select my saved one, it loads all of them. :/