Anyone knows please

I know i can edit my post right after but 10 minutes later I can't edit my post anymore. Sometimes without realizing it we misspell a word or two. In other times while typing the devise end up automatically selecting a different word than the one we meant to write. Also, In some other instances many words almost spelled the same with just one letter difference.

Anyone knows how I can edit my post 15 minute later or even a day later.