Netbackup 7.5 with Storagetech SL500 How to ADD new TAPE via CAP

We have a Netbackup 7.5, with Windows 2008R2 connected to a Storagetech SL500 Library. I know how to eject volume from robot via the CAP but how I could insert new tapes into the robot via the CAP ?

I fulled the SL500 CAP with new tapes but I dont see any menu in Netbackup to ADD those new tape in the SL500...

Thanks