How do you clip their wings?

[Mrs. Fluffy Puffy]

I am having to move some older chicks in a different pen I'm making for them. The run doesn't have a top and they can fly out so I need to know how to clip their wings so they won't do that. Thanks!

 

[MotherJean]

Here you go: https://www.backyardchickens.com/LC-wingclipping.html

 

[Mrs. Fluffy Puffy]

Thanks!
I knew there was a BYC page somewhere on here, but couldn't find it!!!