Is it a revolute joint to ground or between two components in the model?

You don’t need a remote point to define a revolute joint that revolves about some distant axis. What is helpful is to put a coordinate system origin at that location with the Z axis pointed in the direction you want to rotate about, then in the Details window of the revolute joint, you can select that coordinate system and in the location of the revolute joint, type in 0,0,0 for the coordinates of the joint.