It's quite simple. Just find the gif you want, copy its link or download it, and then insert it into your story using the appropriate editor or platform's tools.
Well, usually, on FictionPad, there's a specific button or menu for adding multimedia. Look for something like 'Insert Image' or 'Upload Media' and then choose your GIF from your device's storage.
It's not too complicated. You can usually insert GIFs by using the 'insert image' or 'add media' option in your story editing tool. Just make sure the GIF is relevant and enhances the story.
The easiest way could be to take screenshots of key moments from a video or series of images related to your story. Then, upload those screenshots to a GIF-making website. They'll stitch them together for you. Some popular ones are Imgur and Canva. Just play around with the settings to get the speed and size you want.