1. create a selection of the members you want to add the note to by 'Searching' for them

2. once the correct members are selected from the 'Selection' drop down choose 'Tag'

3. on the 'ADD CONTACT'  side you can add a 'Contact by:', 'Contact type:', 'Contact method:', and/or a contact 'Note', just fill out what you want and press 'Add Contact Record'