Retiring members allows their data to remain in D4H without having them appear in lists with your active members. For this reason, retiring a member is almost always preferred over deleting.
To retire a member:
Open the member's profile
Click Update Details
Click the Status field on their profile and select Retired
Select a retirement reason from the list of options
Click Finished to save your changes
Owners can configure retirement reasons under Settings by going to Modules > Members and then selecting to add or edit Retirement Reasons.