Swap shop

I have absolutely no idea what an applicable exchange item is. It says Rarity 10 weapons. what is actually meant by that. I have 10 weapons in my inventory or I'll use a 10 star weapon and it still doesn't accept it. Please help.

If your trying to exchange to get excubes then yes you have to have 10*-11* rarity weapons to do so, they will show up if you have them when you click on the ex cube option then you just have to use the dpad to select it then click a to say yes, I hope that explains it for you