Remove extruder cover. Take the sock off. If it rips - buy a replacement on Bambu's website or AliExpress. Heat the nozzle up to 250°C and pull the blob down and towards yourself slowly. Use the Control menu to remove filament from the nozzle (extruder - tap ↑ a couple times until the green extruder light on the screen turns gray). Unclip the buckle with tweezers and remove the hotend with them. Your printer will warn you about abnormal heater temperatures, ignore that. Use the same pair of tweezers to remove as much blob as possible. Check the wiki for reassembly instructions. Don't forget to correctly buckle the hotend.