The block edit menu can be used to create or modify custom blocks. If you just started creating a new block, it should look like this:

• Clicking the Cancel button will take you back to the block overview, without keeping any changes you made here.
• If you are creating a new custom block, there will be a Create button. Clicking it will save the block and then take you back to the block overview.
• If you are editing an existing custom block, there will be an Apply button. Clicking it will save the changes you made and then take you back to the block overview.
• The Name of the custom block will be used within the generated resourcepack and can be used in the /kci setblock command. This is also the name that will be shown in the block overview. This name can't contain any special characters, but this shouldn't be needed because players won't see this name anyway.
• The Drops determine which items the custom block will drop when it is destroyed. Clicking the Change... button will take you to the block drops overview, where you can choose them.
• The Texture and model determine what the block will look like in-game. Click the Change... button to manage it.
• The Mining speed determines how much time players need to break the block. Clicking the Change... button will take you to the mining speed menu, where you can configure it.
• The Sounds can be used to configure which sounds will be played when the player performs specific interactions with the block. Note: the player will also hear the mushroom block sounds.