First at all, check that you are using a filament compatible with the Stratomaker 3D printer.
The filament doesn’t come out from the extrusion tube:
Check the temperature and make sure that it is enough temperature for the filament you are using. You can do that by going to the machine’s interface and clicking on “pre heat”.
If the problem remains, cut the filament from the bobbin, go to the machine’s interface and click on the icon “filament”, then click on “unload”, after a few minutes you can remove the fragment of filament by pulling and pushing over the extruder.
To refill the filament, follow the next procedure, here