How to usese HP 103A Reload kit
https://youtu.be/B_GR3RFO7FM Reload the toner when the Toner Level indicator displays +1 or +2, the Toner Reload indicator  is white, and a Toner Low or Toner Empty message displays in the printer software or HP Smart app. If +1 displays, add one Toner Reload Kit. If +2 displays, add up to two Toner Reload Kits. If +2 and the Toner Level warning icon  display, the printer is out of toner. You must add at least one Toner Reload Kit before you can continue printing. 1-Shake the Toner Reload Kit for at least ten seconds to loosen the toner. 2-Lift the scanner to access the reload port.(1200a/w) 3-Slide open the reload port cover. 4-Remove the cap and ring from the Toner Reload Kit. 5-Insert the Toner Reload Kit into the reload port, and then rotate it clockwise 180 degrees or until it stops. 6-Push the plunger down until it clicks. 7-Rotate the Toner Reload Kit counterclockwise 180 degrees, lift it out of the port, and then recycle it. 8-After you reload toner, the Ready light  blinks for 30 to 50 seconds. Wait until the Ready light is solid before sending a print job. 9-Close the reload port cover.
https://youtu.be/B_GR3RFO7FM Reload the toner when the Toner Level indicator displays +1 or +2, the Toner Reload indicator  is white, and a Toner Low or Toner Empty message displays in the printer software or HP Smart app. If +1 displays, add one Toner Reload Kit. If +2 displays, add up to two Toner Reload Kits. If +2 and the Toner Level warning icon  display, the printer is out of toner. You must add at least one Toner Reload Kit before you can continue printing. 1-Shake the Toner Reload Kit for at least ten seconds to loosen the toner. 2-Lift the scanner to access the reload port.(1200a/w) 3-Slide open the reload port cover. 4-Remove the cap and ring from the Toner Reload Kit. 5-Insert the Toner Reload Kit into the reload port, and then rotate it clockwise 180 degrees or until it stops. 6-Push the plunger down until it clicks. 7-Rotate the Toner Reload Kit counterclockwise 180 degrees, lift it out of the port, and then recycle it. 8-After you reload toner, the Ready light  blinks for 30 to 50 seconds. Wait until the Ready light is solid before sending a print job. 9-Close the reload port cover.