Here is a link to the post from the Dev about being a tester and early access for the Boost app. It contains a link to sign up for it.https://lemmy.world/post/5478381
Also, these new communities that I have joined since using the Boost app are not showing the instance name in my list of communities.
Boost for Lemmy @lemmy.world forevigt @reddthat.com 3y ago Bug When joining a new community using Boost, when I try to later go to that community, I get an error message "404 couldn't find community"
The Dev said in another comment that he expected to release it by the end of August.https://reddthat.com/comment/1848765