The hot-end is too low on the heat bed preventing the plastic from exiting the nozzle. You need to reduce the parameter « Z offset » of your printer. reduce it by 0.2mm step at the beginning and once you feel you are very close to the proper value, you can use 0.1mm steps . The plastic should start to get out of the nozzle.
The print temperature is too low, preventing the plastic to properly melt and exit freely from the nozzle. Check that the print temperature is compatible with the material you are using.
The plastic can be jammed inside the hot end. In that case, remove the plastic from the hot end, sharp cut the end of the plastic and try to reinsert it inside the hot-end. Make sure afterward that the plastic exit the nozzle properly.