9:43 PM, Monday June 29th 2020
Currently there's no way to edit existing posts. I might change that in the future, but doing it properly (to avoid the opportunities for people to mess around) is something that'll take a good deal of time and isn't really high on my list of priorities.
That said, imgur albums posted anonymously (without logging in) don't get deleted or expire, so I'm not sure what you mean by them "getting deleted".