To familiarize yourself with CurseGradle, please read the project's official wiki.

(Note: Last updated for Loom 0.2.3.)

The additions necessary for usage with Fabric have been highlighted in green.

They are, in order:

• afterEvaluate { ... } - Loom's remapJar tweaks currently happen after evaluation, and as such remapJar.output can only be read then,
• mainArtifact(remapJar.output) - the primary artifact submitted to CurseForge should be the output of remapJar, that is the remapped (production-ready) mod .JAR file,
• uploadTask.dependsOn(remapJar) - make sure that the CurseForge upload task only runs once the remapped JAR has been built,
• forgeGradleIntegration = false - as you're not using ForgeGradle, that specific integration has to be disabled.