Gotcha. Open two tabs. On one, this network. The other, go to Giphy and search for whatever you think is funny. I typed in "awesome" because I am awesome. There's linkable codes to the right of the gif. In your net post, you copy and paste this into your reply:
Highlight over the URL part, go back to your Giphy tab, copy that link code and paste it over the part that says URL, leaving the quotation marks around it. Final result looks like this:
🤣👆
You can click 'more options' and 'preview' (will open another tab) to make sure it's right before posting.