Connecting a 3d object to spline attractor

I can’t figure out for the life of me how to connect a 3d object to a spline attractor node.
from what I’ve read in the manual, “The splines used by this node are extracted from a 3D object which must be connected for this node to have an effect.” And so I’ve tried to find an input labeled Object Nodes I’ve even ctrl + LMB on the node to see if I was missing anything, but still no luck for the object nodes input. I would really appreciate some help.