Since non-member contacts cannot login to StarChapter, a system admin will need to update contact information on their behalf.
Go to Membership > Non-Member Manager.
Warning: While this can also be completed in the Member Manager, it isn't recommended. If membership is managed locally, members can log in and update their profile using the Member Information Editor. If membership is managed by a parent organization, members should update their profile at that level and the chapter's roster will be updated with the next import.