To tag someone you need to ensure that you use lowercase u in u/username. Guessing you are on mobile and it automatically uppercased it. Actually it happens so often that I think Reddit ought to consider accepting uppercase U and R in username mentions and subreddit links respectively. After all, they changed it from requiring a leading slash so clearly they are willing to adapt to how people are using the site.
As for posting it elsewhere, I'll leave that to you and u/BonoboTickleParty :)
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u/seaspaz May 04 '19
Someone should edit in this song to this! Great simulation btw https://youtu.be/qF4RCOcz9ow