Member Profile questions allow you to gather information about the members of the community
Path: Workspace Homepage >> Apps Icon >> Manage Workspace >> General Settings >>Member Profile Questions 
Adding Member Profile Question: Member Profile questions can be created on both Workspace and community level. These questions allows the workspace admins to gather more information on the members.
Label: Enter the member profile question name.
Field key: It is updated automatically which is used in API calls.
User Instructions: Additional information for members to help fill out the responses visible besides profile questions.
Field Type: Select the desired option from the following field types seen below.
Show on Registration form: Enabling this field, lets the Admin collect additional data about members, at the time of registration itself. The profile questions are displayed on the Registration Form. They are automatically marked as "Required" and hence when enabled the "Required" option is hidden from the Administrator.
When the "Show in Registration Form" is disabled the member profile questions are not displayed on the Registration form.
Required: To make the profile questions mandatory to complete, the Required field switch needs to be enabled.
Private field: Responses of the members can be kept confidential by marking the fields as Private. The workspace admins and the community admins will be able to see the answers to the field marked as Private.
Regularly Update or Confirm Field: When enabled the workspace administrator can specify the time interval (in months) when members will be asked to update or confirm their Member profile fields.
The workspace member profile questions will be visible in the members profile page along with the community profile questions. Members can edit the answers to these questions using the pencil icon next to it.
Who can see it:
This section is available only to all the members of the Workspace. The private marked fields will be visible only to Workspace and Community admins.