How to block or unblock card fields?
If you want to lock specific fields on your account cards, go to Permissions in the administration section.
Select the team
To start, select the team that you want to apply special permissions too.
Once you have selected the team, you can decide if you want to allow or not allow the editing of a specific card field.
Lock or Unlock
To lock or unlock a specific field, simply click the Editable checkbox to on or off. If on, users can edit that field on their cards. If it is off , they will not be able to update it. By default, all fields are editable.