You need to use the set access command from the client DSMC prompt.  Here are 
the instructions right out of the manual....

The set access command gives users at other nodes access to your backup 
versions or archived copies. You can give another user access to a specific 
file, multiple files, or all files in a directory. When you give access to 
another user, that user can restore or retrieve your objects. Specify in the 
command whether you are giving access to archives or backups.

Note:
You cannot give access to both archives and backups using a single command.
Syntax

>>-SET Access---+- Archive-+---+- filespec----------------+----->
                '- Backup--'   '- {filespacename}filespec-'

>----- node---+-------+---+-----------------+------------------><
              '- user-'   |  .-----------.  |
                          |  V           |  |
                          '---- options--+--'

We usually end up giving full rights, so you would enter this command on client 
NODEA at the DSMC prompt...

set access backup * nodeb