Talk:Juzumaru Tsunetsugu/@comment-112.208.54.117-20160318115928/@comment-27403109-20160318122749

It's under the smithing box. You should see a little dropdown menu and you can just select the ofuda. Even if you can't read Japanese, it's easy to use because the ofuda you intend to use will appear in the left corner in a little picture frame.

There's a more detailed explanation with photos at the beggining of the wiki page

http://touken-ranbu.wikia.com/wiki/Smithing