How can I switch default messaging to wats app

[AC Question]

I used to have a s3 and in it when I swiped right it gave me option to use wataspp, texting etc. However my s6 does not ask that optnion . is there any way to force s6 to use watsapp for contacts having watsapp.

 

[B. Diddy]

Welcome to Android Central! Are you talking about accessing WhatsApp directly from the lockscreen?