Redmine

Sorry for the vague subject.
Actually I am exploring Redcase as a test management tool. I am able to add test cases to the project, create test suite in Management > Test Suites but that is as far as I can go now.
I am not able to edit Execution Suites properly. I added a suite but not able to add test cases to them. Dragging and dropping from Test-Suites is not working. Is there any other way of doing it?
Since my Execution Suite is broken the execution page is hard to understand.
I have an execution suite (with no testcases in it), I have a version and a default environment. No idea how the page will behave with test cases in Execution list but for now it shows almost nothing. A folder tree is visible below and the Execution Info is blank. How are they supposed to behave?
How do I go about executing test cases which will reflect in my Reports. It's bland too. :(
Let me know if you need more information. I myself is trying to understand this plugin workflow and if I get any additional info will share here.
Thanks in advance.