How to block someone on whatsapp?

He is really annoying me with pictures etc?
Though there ain't no "block " button on the whatsapp chat

I have a iPhone 5s, please tell me!
Thanks!

Ps: I also blocked him on my iPhone phone book and he's still calling etc
I just need him blocked on whatsapp

Tell him straight up to stop bugging you, instead of being slick.

Check this page:
http://www.whatsapp.com/...e/20950271
It'll help you.