I'm using Orion browser Version 1.0.2 (141), WebKit 624.1.2.19.2 on MacOs 15.7.2.

There's a plus button on the right hand side but that's for adding a feed. I'm able top reply to threads (as here) but for the lifde of me I can't see it, be that on following, your you or discovering feed.

Actually, sorry found it! It had been hidden by the burger tab on the top left right hand side. Might be better the post button doesn't get hidden with the other items? Had a feeling it was me being daft...