
Buttons in relevant positions to command-signs will execute the commands on the signs.
Long version (kind of important): Documentation
This plugin doesn't hook into NMS or CraftBukkit, only the Bukkit API, so it should work on most upcoming Bukkit versions. If there's no big red line somewhere in this description saying it's broken, it isn't yet.
Q: Why don't redstone commands work?
A: You or your server is doing it wrong. These three ways work as long as you haven't touched any weird settings and don't use any weird plugins: Three ways of setting up redstone command signs
Q: Why don't something else work?
A: Please check the Known caveats on the latest file (files).