well i want to sell my Full juryo set in the market but how can i change the name full juryo??

You should make your thread titles a bit more descriptive.
Anyway, go to your deactivated and theres this edit button next to activate button on sets, click on the edit button, and there should be these 2 lines where you can put the set's price, and on other one the set's name.

Push edit on the set you want and just change the name same as the price.
Ninja'd.

ohh ok