The custom relations for the current concept are managed in the Custom relations tab of the Edit Concept panel.
To relate a concept, type in the Find concept field under the name of the relation.
Existing concepts with matching label or URI are displayed in a pop-up menu and you can pick one.
For multi-instance relations you can add more related concepts by selecting the plus button under the relation name. A new Find concept field appears and you can use it as described above.
To delete a relation, hover over the related concept and select the X button .
To make a related concept the current concept, hover over it and select the graduation cap icon .