Hi, Doug.
That's something you should had done *before* you changed your authentication settings. You had to add one of users imported from backend to "Managers" admin group. As of now the only way is to manually edit entries in LDAP with console tools, or GUI tool like Jxplorer. You'll need to select one user entry, get its full DN, then find "Gluu managers" group in the tree (initially its a single group under "o=groups" node) and add a new "member" attribute to it with DN of the user entry you chose as a value.