Avoid showing "Quote" button on 1st post of thread

[RateU]

You can install PHP in Templates / Complex Templates or Template Conditionals plugin.
Use this condition in your postbit_quote button (depends on your theme):

HTML Code

<if $post['pid'] != $GLOBALS['thread']['firstpost'] then> .... </if>

---

For example (based on the default MyBB 1.8* template):

HTML Code

<if $post['pid'] != $GLOBALS['thread']['firstpost'] then> <a href="newreply.php?tid={$tid}&amp;replyto={$post['pid']}" title="{$lang->postbit_quote}" class="postbit_quote"><span>{$lang->postbit_button_quote}</span></a> </if>

---

You can do that also for postbit_multiquote template if you want.

Other alternative is by using CSS.