From the Work with Media Libraries display (WRKMLMBRM) command, select option 1 (Add MLB media) against the media library device that is attached to your system. This takes you to the ADDMLMBRM prompt display as shown below.
Add MLB Media using BRM (ADDMLMBRM)
Type choices, press Enter.
Media library device . . . . . . > MLB01 Name
Volume identifier . . . . . . . *INSERT Character value, *INSERT
+ for more values
Add volume to BRM . . . . . . . > *YES *NO, *YES
Initialize tape . . . . . . . . *NO *NO, *YES
Media class . . . . . . . . . . > CART3490E CART3490E, QIC120...
Last moved date . . . . . . . . *NONE Date, *NONE
Move policy . . . . . . . . . . *NONE *NONE, OFFSITE
You can enroll all newly-inserted volumes into the BRMS media inventory. If you use the default value for the VOL parameter (*INSERT) and change the Add volume to BRM field to *YES, all volumes that were previously in the *INSERT category (from the Work with MLB Media display) are enrolled into the BRMS media inventory and are available for use.