How can members change their data on their own?
If Members are also WP users then let them log in and have access to either a CiviCRM Profile (https://docs.civicrm.org/user/en/latest/organising-your-data/profiles/) or a Caldera Form and you should be able to set up the fields you want them to have access to via the form

If Members are NOT WP users then you can send out a Mailing with a checksum link to a Profile so they can make their changes without logging in