Can you be more specific about what you have tried and how?
Have you been here:
I've went to effects > rotate over time > and then choosing a value, but it either spins too many times or too slowly, or (transform) > rotation, but it is red and you can't alter it.
You misunderstand the difference between animation presets and effects. What you have is an expression driven preset that uses an effect. It would be a good idea to read up on this stuff and just the same you might want to read up on basic keyframing techniques.