Run miscord in the console.
If you store your config somewhere else, you can run it with miscord --config {path} like this:
In this example config is stored in a folder called miscord in your home directory
miscord --config ~/miscord/config.json
Enter the Miscord directory where you cloned it (cd miscord)
Run it using npm start.
If you store your config somewhere else, you can run it with npm start -- --config {path} (note the -- before --config) like this:
In this example config is stored in a folder called miscord in your home directory
npm start -- --config ~/miscord/config.json