Clone offset hotkey

I'm new to Fusion, or at least haven't used it professionally since the days the node pipes were represented as plumbing pipes and elbows.
I've been working on Resolve quite a bit and I'm in dire need of paint. Fusion paint seems to be simple and reasonable except I can't figure out one thing. How do you interactively pick the clone source in paint? Sort of like ALT+click in Photoshop. The tool manual's Paint entry is silent on this subject.
I've been working on Resolve quite a bit and I'm in dire need of paint. Fusion paint seems to be simple and reasonable except I can't figure out one thing. How do you interactively pick the clone source in paint? Sort of like ALT+click in Photoshop. The tool manual's Paint entry is silent on this subject.