As you can see below, I already posted this topic. But, that topic got little attention and I thought I had figured it out. But I didn't.
So, I have a Mac and I'm running Blockland off of Steam. Overtime I download an add-on, they come as a folder. Keep in mind I'm on a Mac. So I thought that by compressing the add ons and making them .zip files, they would work. Unfortunately, that was not the case. Nothing happened. I went to Custom Gamemode, and no new add ons had shown up. Am I supposed to edit something? Please help!