How to do trade guardian without middleman?

[kugogizo]

All of my threads say, "buy with middleman", I had one buyer who used this option and immediately opened a trade forcing him to use a mm, it didn't offer the option to do TG for free. Of course I haven't used it myself so I'm not sure what he saw, however that's what he told me. So, how can one open a trade with TG for free? and is there a way to change my thread to say "buy with trade guardian free" instead of "buy with middleman"?

Edit: Nvm I found it, however my question still stands, Can I add it on my thread in place of "buy with middleman"?

 

[The Integrity]

If you set it like this:

The button will show

Only downside is that you have to set a price.