Custom fields can be edited from the Home screen of the main tabs or in a specific contacts record. Custom fields can also be edited for multiple contacts at once.
Inline Editing from the home page of People, Link Partners (Media Outlets), and Links
Make sure the the custom field you want to edit is in your column view.
Select the row you want to edit and click on the value of the Custom Field.
Complete your edit and save to finish.
Editing Custom Fields in a contacts record
Locate the contact you want to edit. Go into their record.
Select the Edit button next to the name of the contact.
Find the section labeled Custom Fields and locate the field you want to edit.
Complete your edits and click save to finish.
Editing custom fields for a group of contacts
(For detailed instructions for Editing multiple contacts see "How do I edit multiple contacts?")
From People or Link Partners (Media Outets) - Use the checkboxes to select the contacts you want to edit the custom field for.
From the sub nav found under the search bar - select edit and choose Custom Fields.
Assign the value you want for the custom field. Click OK to finish.