Editing a contact on Segwik is a piece of cake.
Editing a Contact:
Click on any contact you wish to edit from the Contact List.
On the left side, under the Primary Details area, you will find Additional Details.
Select the details you wish to edit.
Upon making any change, the Save Button will become visible at the top of the contact details.
Click the Save button on the top left when you are done editing.
Pro Tip: Alternatively, if there are attributes you wish to add to a contact, simply click one of the attributes directly below the Primary Details area. This will make the attribute visible below and where it can be edited.