Not sure what exactly you need to know. Are you trying to lift the presser foot or change the presser foot to another one? If it is lifting, there will be a lever of some kind behind the machine. On one of my Husqvarna machines it was a big flat "paddle" shaped lever, not sure what shape it is on the Emerald machines. Lift the lever from the bottom upwards and outwards. Most Husqvarna machines have clip on-and-off feet. You just gently pull forwards on the foot (while the presser foot is raised) to remove it, then push the new one on making sure the small bar part of the presser foot goes into the clip on the presser foot ankle.
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Not sure what exactly you need to know. Are you trying to lift the presser foot or change the presser foot to another one? If it is lifting, there will be a lever of some kind behind the machine. On one of my Husqvarna machines it was a big flat "paddle" shaped lever, not sure what shape it is on the Emerald machines. Lift the lever from the bottom upwards and outwards. Most Husqvarna machines have clip on-and-off feet. You just gently pull forwards on the foot (while the presser foot is raised) to remove it, then push the new one on making sure the small bar part of the presser foot goes into the clip on the presser foot ankle.