I need help!!

[Shazzade]

I hope I am in the right place. If not, please forgive me, I've never done this before and I couldn't find the name of the game I'm playing on the list. I am trying to double up weapons in Two Worlds. There are two swords. They are the same class, category and have the same damage ability. They are green so I know they can be doubled, but how do I do it? I've been trying for over an hour and it is getting very frustrating. I don't think I'll be popular with my husband if I throw my new xbox out the window! If anyone can help I would be very grateful. Thank you.