The Behance Publish Service plug-in has been removed as of Lightroom CC 2015.2/6.2 pending enhancements to Lightroom's Behance integration. Stay tuned for updates.

Workaround

You can export photos from Lightroom and upload them directly to your profile on the Behance website, either as a Work in Progress or a Project.

1. From Lightroom’s Library module, export the photo(s) you’d like to share to your local hard drive.
2. Log in to https://www.behance.net/ with your Adobe ID.
3. Click My Portfolio to see active Projects and Work in Progress.
4. Click Add Work to upload new photos you exported in step 1.