what's the function of runtime defined setting to process role?

<h3>*Hi ladies and gentlements,*

*I am new to guided procedure. I have meet a case that I should runtime allocate the roles or users to process action.*

*But after I set it to runtime define, It seems nothing activated. I had initialized it and saw it within the UWL. But when I opened it, it message "the action is ready to process by another user or role".* I don't know how to runtime define the role of action. Any body can tell me how to implement that?</h3>

*Thanks*

*Eric*