I entered the defect in teamtrack and it has gone to the next stage and finally it has come to me and it is in the pending validation stage. I have updated the defect(issue) but still the status remains to be same? how to change the status from pending validation to closed stage?
You need to use the "Resolve" button which can be found on the top of the defect page. It will ask you to state the verifier name and probably a resolution note. You will see that the defect (Issue) will show up as closed once you click "OK".