Change interface description

user@SW1>configure
user@SW1#edit interfaces ge-0/0/8.0
user@SW1#set description NLAM0C0VSHE00-DRAC
KKWW002-OOB# show
user@SW1# exit
KKWW002-OOB# commit    
user@SW1# exit

http://routersimulator.certexams.com/juniper-sim/labs/index.html

Delete description

user@SW1>configure
user@SW1#edit interfaces ge-0/0/8.0
user@SW1# delete description