Talk:Kiwame/@comment-30030136-20171016160644/@comment-2A02:A31E:401E:6600:111E:7FFE:451:63-20171016161256

It's right there in the wiki article: "You may choose to let an eligible sword undergo Kiwame at any time by pressing the Training (修行) button in the Refinery menu."

Note that you can only have one sword out on kiwame training at a time, however.