How to write slogans under the equipment

There are no grades, no grades or anything. As long as it is equipped in a backpack, you can buy a pen and ink in the mall. As for the news, it may be that the name of the character has been changed, written with the surname, and the name has not been written on the equipment. The other is a tradable device. Buy 60 sets of parts, write a message and then trade it to others, even if the equipment is upgraded.