To change a pin name in Flux:
- Open the part project for the component—not just the schematic where it is placed.
- Select the pin/terminal on the schematic symbol.
- In the properties panel, edit Terminal Name or Name.
- Keep the Terminal Number unchanged unless the physical footprint pad number must also change.
- Save/publish the updated part, then update the component version in your main design.
You currently have comment-only access to this terminal-block project, so you cannot rename its pins directly. Fork/copy the part into a project you own, then rename the terminals there. Pin names are logical labels such as OUT1; pin numbers (1, 2, 3) map to physical footprint pads.