The most popular way is to open topics on this forum and brag about it.
Try it out, these threads are super popular here! You can also try to spice things up by making multiple alt accounts that praise the superiority of your main account.
If you simply want to publish your rating right on your Dotabuff account page, though... that doesn't work.
Bitte melde dich an um Kommentare zu posten.
I wanna share my mmr with anyone else, how to do it?