Type a password into the password field before posting. Leave it there.
You can delet posts you made with passwords, with the form at the bottom of the page. Mark the checkbox at your post, then go to the form, type your password into the password field, then click delete.
Note: BOs have options to turn off user deletions.

>>18342
But what if you didn't add a password to the original post?

Then you don't.