In the example below I created one from scratch and chose to load an image from their free database. Once the picture, or pictures are found, you then have the options below for what social media site you would like to use.
Once created you then have additional options as well. The one I focused on dealt with effects. I altered the way the text was presented and then downloaded the newly created 4 second "video". I would recommend downloading the video and then uploading to Giphy to make it into a GIF. You can then share it where you would like to.
Embedded below is a 2 minute and 24 second YouTube tutorial.