Hello. My name is Mark and I will be assisting you today.
The drum should normally just pull off but sometimes it can seize to the hub or have a wear ridge inside that fouls the shoes or a combination of both.
The first thing to do is slacken back the handbrake cable fully to see if that helps.
Next is to use a hammer and try shock the drum from the hub.
You can also try a large screwdriver or prybar to lever the drum off.