Parkour Parkour Modifiers not Working?

[hoppyfrog28_]

I'm not sure if parkour modifiers aren't working or if I just don't know how to use them. How do I select a modifier? I've tried everything and I can't select a modifier

 

[Blom]

just tried it, it seems bugged out. You can make a bug report here: https://www.cubecraft.net/categories/bug-reports.151/