Gregory's Server
All apps have the boost button below all posts. It looks like either arrows 🔁 or a rocket 🚀 depending on which app you're using.
In some cases the boost button may be greyed out if the post's visibility setting prevents it being shared with your followers.
@FediTips I think I see what happened – 're-tweet' and 're-blog' got interpreted as 'quote-tweet' esp. as I'd seen references to Quote toots recently. Sorry about that. I know about the boost button, alas. Thank you though 🙂