Auto Installation after puting client in client group

Hello,

i am new here and have a questinon. 
I create several client groups for exampel "Windows Server" in SEPM. In this group i create a client installation package.

If thougt that the rollout starts if i put a client pc in this group but nothing happens.

What did i wrong or is it not possible that the package was enrolled automaticaly after puting the client in the group?

Thank you very much!!!