How do I add artists/makers to an object? Can I add more than one?

Following the creation of an object you may create a new relationship to Artists/Makers. From the bottom of the screen, click/tap "Add new relationship" and choose Artists/Makers as type. Then choose the required artist from the list (you may use the filter if you have lots of entries). 

Once a name has been chosen, select a relation/role and add notes if appropriate.

Image showing how to define the relation between objects in the relationship tab

You may add multiple artists/makers to any objects. If you need to edit the list of available roles you may do that in the Lists tab.