First , Here is the video load the filament out of the nozzle. Please preheat the nozzle to 220C and click load to load the PLA filament out of the nozzle , and see if the filament comes out from nozzle successfully.
During the filament loading, if the extruder makes clicking sound, it might because the filament got stuck in the extruder or hotend,
Please follow the video to solve the clogged issue.
Here is the video of solving the clogged extruder.
Here is the video of solving the clogged nozzle.
Here is the video of solving the clogged hotend.
Here is the video of fully dissemble the extruder and assemble back.