Here are things to try:
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Make sure the "View All Addresses" group is not selected.
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Make sure that the selected group is not a read-only MySQL group. Read-only MySQL groups are indicated by a small padlock icon next to the group's name.
As long as you have selected a non read-only group (e.g. not "View All Addresses"), you should be able to add new addresses.
Make sure the "View All Addresses" group is not selected.
Make sure that the selected group is not a read-only MySQL group. Read-only MySQL groups are indicated by a small padlock icon next to the group's name.