Pls let me know the procedure to run the test casses through Quality center

Transfer the Test cases to the test lab section and then execute the tests, once done ,specify the test as passed or fail from the drop down menu.

To run the Manaul testcases in QC.
Once you create your testcase in Test Plan tab goto Test Run tab,Select the Testcase you want to run on the leftpane where you see your Testcase folders and test cases which you created in Test Plan tab.
Click on the testcase it opens window where you need to execute your Testcase step by step which you created.
You can even change the steps here.
Once your done close the window and you see the the result on testlab of pass/fail depending upon-- if all your steps are pass then its PASS if any of ur step in ur testcase is fail then the Testcase FAILS.