Hi, I have been sent a couple of custom nodes which I can drag & drop into a new blank workflow. How do I save these and make them available in the Node Repository so I can re-use later without having to find the existing workflow and copy/paste out?
By “custom nodes”, do you mean components? If you do, you can share components, at which point they will appear in your KNIME Explorer pane (not the node repository). More info on that in our documentation here: KNIME Components Guide
(If you are actually are referring to real custom nodes that someone else wrote, you will need to install the extension those nodes are a part of to find them in the node repository.)