How do I attach a helmet to a knight model?

Hey. So I bought this 3D knight model on epic store and the basic mesh comes without a helmet. The helmet itself along with a weapon and a shield is included as a separate object. I’ve been trying to put the helmet on the knight using sockets but even following youtube videos step by step it doesnt seem to work. I want to replace the standard mannequin with the knight and put a helmet on his head. I’m so frustrated :frowning:

Can you guys help?