Basically your post is already "posted" there. Anyone with a mastodon account on an instance that federates can see it. They could either paste on their mastodon search interface the url to this post and see it appear as a mastodon message. They could then reply on mastodon and it would show for you here on your lemmy instance.
They could also follow your account on mastodon or a community just as if you were a mastodon user and then see your posts on their timeline.
Animal ag fucking everything it can, once again. Grow the fuck up and start drinking some plant milk like a normal human.