Thanks again Christi, but I still don't understand 100%. You said the above text is input into the code of the userfield_textbox, but I don't see how it could translate that. Let me confirm that I'm supposed to add lines exactly as you typed them into here:
Code:
<fieldset class="fieldset">
<legend><label for="ctb_$profilefieldname">$profilefield[title]</label></legend>
<table cellpadding="0" cellspacing="$stylevar[formspacer]" border="0" width="100%">
<tr>
<td>$profilefield[description]</td>
</tr>
<tr>
<td><input type="text" class="bginput" name="userfield[$profilefieldname]" id="ctb_$profilefieldname" value="$bbuserinfo[$profilefieldname]" size="$profilefield[size]" maxlength="$profilefield[maxlength]" /></td>
</tr>
</table>
</fieldset>
<input type="hidden" name="userfield[{$profilefieldname}_set]" value="1" />
Please forgive my ignorance

Is it possible you mean to use an html editor to add this to the above code?
I don't see the exact name "User Profile Field Manager":