If you want to post a link, just post a link. The #1 noob mistake for posting on HN is that somebody feels they just can't post a link so they start a discussion and then they find out the URL can't be clicked.
I suggest you create your code in GitHub or GitLab and separate that long pastebin in three files: README.md (explain Why and What this is, add your gofundme and other comments), LICENCE file and actual code file.
Submissions can't be edited, just like on Reddit, and for the same reasons. Best you can do is comment on it.