I found out what my problem was. Your instructions in Step one should be clarified.
Where is says find:
"lang_comment" => $lang['comment'],
Add Below:
"lang_postcards" => $lang['postcards'],
You should let people know that this line appears twice in the details.php file
"lang_comment" => $lang['comment'],
The added line should be added under this section:
//-----------------------------------------------------
//--- Print Out ---------------------------------------
//-----------------------------------------------------
AND NOT THIS SECTION:
//-----------------------------------------------------
//--- BBCode & Form -----------------------------------
//-----------------------------------------------------