Memmy - An iOS client for Lemmy

I’m not sure how to add new fediverse(sp?) to my “all” feed. I can get to them by using a couple of different search engines that were recommended, but I can not for the life me figure out how to add the ! I’ve tried using the search bar but nothing pops up and entering !whatever.xx and it doesn’t find anything. I know got to subscribe on what I see in all but would like to add. Ore of an array of things as it was recommended in one of the posts for us Reddit migrators. Thanks I’m advance and apologies if I am missing something simple.