Go to your profile or an area where your avatar is displayed.
Creating a GIF of your animated avatar (avi) involves capturing the asset's URL and using a converter to ensure it maintains high quality and doesn't "stack" frames.
Upload the saved GIF directly to blog posts, DMs, or chat windows using the "upload image" button. Pro Tips for Quality
Apps like WowKit can be used to set your final GIF as a moving widget on your phone's lock screen.