To add a GIF to a board, you'll want to follow the instructions below:
1. Go to the board you are wanting to add a post to and select "+ Add to Board" from below the board title.
2. From there, you'll be taken to a page where you add your message.
3. Choose "Add a GIF" from the options, and then you should see "GIF Library" (you can also choose to upload a GIF saved on your device).
4. Clicking on that will open the Giphy library where you can search for your GIF. Once you have selected your GIF add an optional message below and then click "Post" to add your message to the board.