How to re-use the old tape

Hi all,

This is my first time to hand-on the backup, especially veritas netbackup 6.5. I do not have much information about the current backup process nor the status of each tape in my store room and now I wish to re-use one of old tape but it seems that I cannot get it assigned. Could you please instruct me how to re-use a tape?

Please be informed that I am using NetBackup 6.5. In the media list, I can see the tape in question but its assigned date is empty. I have gone through forums and they said that I should import the old-tape to make it useable, is that the correct thing to do?