Can I delete pics from a post I made yesterday, or do I have to ask a mod to do it for me?
I think if you go to the post with pictures and hit edit, you can delete the them
You'll have to ask a mod now. You can only edit posts up until 10 minutes after you create them.
There's a backdoor way to do this as well, you can go to User CP, then under Misc., go to Attachments, you will find a list of all the attachments you have uploaded to the forum. You can delete from there - your post will still be there, except there's no more attachment to be displayed.