Put the uneaten half in a sandwich bag or something, that’s what I do with my other half eaten stuff. Like the other half of a cosmic brownie (did you know those things have like 50% of the recommended daily maximum sugar intake? Or the other pop tart in the package of 2 (the serving size is 1 but they put 2 in a package that can’t be resealed?)
I discovered that if the subreddit hasn’t been accessed from your instance before, then you have to copy and paste the link from the original instance into the search bar, then it’ll start showing that community