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http://knoppix.net/forum/faq.php?faq=vb3_reading_posting

well, yeah I also:

1) make the image file read-only
2) make their attributes unmodifiable (lsattr chattr)
3) resize the file system to its bare minimum (using gpated)

but a boot ro from...

after noticing the corrupted formatting but I can't edit it at all

why do you make so hard properly formatting a message? Why can't poster not enter plain html?

there actually is a way to boot from an iso knoppix image which is mounted read-only (ro), namely: using the "forensic" startup option. You would, say, startup with the one liner: then on init 2...