I've seen the solution and it could solve my problema but I've noticed that maybe I've another problem.
I think that the aim of the system is that the users could register as...(whichever role they want, author, director, reader...) during their registering phase, doesn't it?
Then I've ckecked the "Ocs in an hour" and when a author want registering, there is a proposal subimision and call for papers option in the main menu of the conference to make that, then I've gone to my conference and I've seen that both options aren't there. You can see the image:
Also, I've thought that the problem was in the calendar dates, then I've changed some dates, but the result was the same, you can se the calendar:
By the way, Have you see this discussion: viewtopic.php?f=3&t=2393??
Lots and lots of thanks again.