How to create Facebook carousel posts:

First of all, go to Planner and then click Posts. After that go ahead and click Create new

Choose your Facebook group/page, create your desired post, and add 2 more more pictures to make a carousel.

Once your post is finished either Schedule it for later or click Post Now as per this example.

Once your post is scheduled It should light up green with the date as shown in the picture, or scheduled like the one next to it with the date when It should be published.

After It was posted you can go ahead and check Facebook, It should be posted without any issues.