I don't have a picture to show you, but it's simple enough.

Bolt the tool to the bottom bracket cup however you choose to so it cannot climb or twist out.

Then take the whole frame with tool attached, and hold it horizontal tool side down, clamping the tool into your vise. Now with the tool held securely, turn the frame, just as you would a wrench.

Unless you own a three foot long wrench, this is the most leverage you could possibly get.