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Click on the Mail List you wish to subscribe to and click the "Subscribe to selected Mail Lists" button.
To select multiple mail lists at once, drag over the lists or hold down your <CTRL> key to select the ones you want then click "Subscribe to selected Mail Lists" button.
Click on the Mail List you no longer wish to subscribe to and click the "Remove from selected Mail Lists" button.
To select multiple mail lists at once, drag over the lists or hold down your <CTRL> key to select the ones to which you no longer wish to subscribe then click "Remove from selected Mail Lists" button.