Where does a "saved" post go?

I should probably rename that button to "Post". 

"Saved" is just "Posted", when you make a new topic. Where did it go? It went to whatever forum you were posting in.

To check your created topics, just go up to "My Stuff" (top right of forum page) and select "My Topics" - it will bring up a list of all of your Posts ( just a list of  posts that you started, not any of your replies made to other people's posts...)

PS: I just saw you said it was during a "reply"... that means it went into whatever thread you were replying to... it looks like your most recent reply was this one: https://www.rotax-owner.com/en/general-tech-discussion/7493-cuise-rpm-and-prop-pitch?start=5#p23688