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still can't found it
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2.8.3. Edit members of this group
The final section on each “Modify group” page displays a list box of “Non-members” and “Members”. This list is specific to each group you are viewing.
All registered members will be shown in one of these list boxes. You can remove and add members for any group by using this feature.
The XOOPS Core Development Team recommends that each user be part of only 1 group. Doing this, you’ll be assured that no conflicts occurred.
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I can't ADD members