In case you want to change the coil, the first step is to bring the extruder to room temperature (at least 180°), then you have to turn the wheel by hand to extrude the filament. After the extruded filament (5-6 cm), you can open the tab and rotate the wheel instead to pick up the thread.
Done this, remove the old spool from its mount and install in its place a new one.
You can reinsert the wire, making sure it is correctly pulled from the sprocket.
The certainty of having successfully reel change, as you will have when you try to extrude the new material.