Greek76,
open up phrasemanagement -> search for phrases and type: sid_hide (search for phrase
name)
you will be shown 13 Phrases in
GLOBAL phrases.
these are shown up your forum (all others are from the admin control panel )
edit the ones called sid_hide_img_xxx to edit the text (or images) shown up in showthread.php
or the ones named sid_hide_txt_xxx to edit the phrases shown up in printthread.php.
TTG,
exactly as in any 3.6.2

Upload the images (en_hide_xxx.gif) to forumroot/images/ (no subdirectory)
import the xml attached to post#159 via Phrasemanager to your language (do not create new language) and make sure you've checkmarked "ignore version"
and then, if hack is enabled and not disabled in the specific forum it'll show up the images
'sid
PS please everybody, if you use the hack, mark it as installed, thank you