If I no longer wanted an upload associated with my account, could I just flag it for deletion like anything else?

No. We only delete posts that violate our Terms of Service, are inferior duplicates or if an artist submits a DMCA request form.

Why don't some images show up on mobile? Logged into the same account with the same blacklist and everything.

i.imgur.com/XsWwuJ8.png
i.imgur.com/CHtHcFJ.png

I think the "Display all site content" setting doesn't carry over between devices/browsers, so posts tagged with "loli" are not displayed.

That'd do it.

What needs to be done for an account to be considered "active enough" to use private messages?

You’d be better off sending smoke signals.

Idr where requests are supposed to go but can anyone tell me what this gif is from? Saucenao and trace.moe are both coming up empty.

i.imgur.com/Bf2zu5w.gifv

I was hoping to get some help as I'd like to reply to a message I got but I got a screen and text saying "My account is too inactive" Does that mean it's too new. If so, how long do I have to wait and if not that, then what do I do to be able to send messages and such.

Try contributing to the site.

Read first:
gelbooru.com/tos.php
gelbooru.com/index.php?page=wiki&s=view&id=207
gelbooru.com/index.php?page=wiki&s=view&id=2533
gelbooru.com/index.php?page=wiki&s=view&id=6645

Poor contributions may be removed lowering your scores. If your scores fall too low you may be denied from contributing any further. Spam us and we may ban you.
Good contributions will raise your scores giving you more access to site functions.
To prevent abuse of the system we will not specify what actions affect scores or how your scores are affected by those actions. We will also not specify how your score affects your access to the site. These particulars may change with time and (being unknown even by me) may even be randomized for each user.