implementing crux

Hi, my name is Aj. i am a Phd student working on developing new and more efficient methods on supertree reconstruction. my problem is i would like to use crux to search tree space (i.e. to propose a tree) following mcmc, and score them using the ML valkues we estimate but i cant find any toturials on how to use crux and i was wondering if you give me any help. thanks Aj