Adding gifs to posts or comments is almost the same as embedding images, but - with a simple extra step.
To grab any Giphy link, just hit the 'share' option and then 'copy GIF link'.
Then just copy the syntax below and replace the gif description and gif link with your gif link from Giphy.
This will then render in your post or comment like this:
Let me know in the comments below if you have any issues doing this and we can help out no problemo!