To reset the enable password if you don't know it; you'll need console access to the controller and follow these steps:
User: password
Password: forgetme!
(aruba) >enable
Password: enable
(aruba) #exit
(aruba) >exit
Log back in as your normal admin account and test that the enable password is reset to enable. You can then use the "enable secret" command to set it to something you want:
(aruba) #configure terminal
Enter Configuration commands, one per line. End with CNTL/Z
(aruba) (config) #enable secret
Password: <new enable password>
Re-Type password: <new enable password>
(aruba) (config) #write memory
You can use this same procedure to reset the root admin password as well. To do so, you'd run the following:
User: password
Password: forgetme!
(aruba) >enable
Password: enable
(aruba) #configure terminal
Enter Configuration commands, one per line. End with CNTL/Z
(aruba) (config) #mgmt-user admin root
Password: <new admin password>
Re-Type password: <new admin password>
(aruba) (config) #exit
(aruba) #exit
(aruba) >exit