When you are needing to change the joined date for a group member, but are unable to do so, it may be because the group type is not set to allow group leaders to edit member record. To allow this:
1. Click Groups > Admin > Group Type
2. Select necessary Group Type
3. Click Edit Admin Rights
4. Click check box for Edit member records
5. Click Save changes
2. Select necessary Group Type
3. Click Edit Admin Rights
4. Click check box for Edit member records
5. Click Save changes
Updated