Redmine

I've searched hard within Redmine and using Google but can't find the below. (Please just point me to the answer if it's there. Thx.)

Version reported by Administration > Information is Redmine 1.1.1.stable (MySQL).

I'm trying to use Redmine as a project manager, with projects, tasks, and subtasks (to several levels).

1. I created two issues (for me, tasks) and would like to make one task a subtask of the other. How can I do that?

2. If I have a subtask, how can I make "move" it so that it has a different parent?

Thank you.