Adjust custom fields

How do I adjust custom fields?

1. In the left menu (in sidebar) go to Address book->All contacts
2. Click on the Edit Custom Field button on the top right. Depending on the viewport, it may be hidden under the More actions button (the symbol of three dots above each other)
3. Fill in Custom Field. There are 10 custom fields available. The values you fill in for these fields will be displayed for all your contacts
4. Click on Save