1. Find the .gif on-line that you wanna share,
2. Copy the URL of the on-line .gif,
3. GoTo the new post draft block on iRV2 (quick reply or advanced - no matter),
4. Select the "insert image" icon at the top bar of the reply (yellow block - looks like a cartoon photo of a mountain),
5. Insert the URL of the .gif into the pop-up block.
6. Hit OK.
The image must be on-line...at least I haven't found how to post a .gif from my computer's hard-drive and have it run.