How do I unstick my Windows phone from the Whatsapp answering messaging system?

[WPCentral Question]

i seem to have my samsung windows phone stuck on the whatsapp asnwering message system

I turned on in whatsapp settings the answer, read texts and notifications button and now my cell phone is stuck on the screen lock and not taking me into my cell phone disk top. it says phone locked enter password and I do but it is not processing anything and is just stuck on the keyboard pad.