Problems with rigging in Advanced

Hello! I’m trying to do a rigging of a character but I can’t figure out how to do attach her arms to her torso. When I try, the arms deform.I added a picture to explain my problem. Probably is a problem about the pegs or the hiearchy, but again, no idea what.

If anyone knows a tutorial about rigging in advanced, I would also be really thankful! I only find how to do it in essencials or premium.

Thank you so much Icanau you solved my problem!!!

Hello??? Doesn’t anyone know?

You have to add a kinematic output in order to use the position but to ignore the deformation information from the parent to the child layer.