tattoo aftercare?

Got my first tattoo yesterday, it's pretty big and I was so happy when it was done I think I didn't entirely listen to what the tattoo artist said.
He said something about washing it 2-3 hours after it was done and putting on some lotion.
Do I have to wash it now again (I just woke up it's 6:35am in Germany) or should I not touch it? I think I have to clean it but I'm not sure...