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1. Tags & functions > API Data Creator
Code:

<div class="phdr">Chat</div><div class="menu">Content:<br/><textarea name="content"></textarea><br/><button type="submit">Chat</button></div>

Config:

<PID>enter forum post id</PID><CATEGORY>post</CATEGORY><KEY1>name</KEY1><VALUE1>:VAR(USER_NAME);</VALUE1><KEY2>content</KEY2><VALUE2>:POST(content);</VALUE2><KEY3>time</KEY3><VALUE3>:DATE(U);</VALUE3>

Item will be visible for: Admin & user
2. Tags & functions > API Data Lister
Code:

<div class="menu"><table width="100%"><tbody><tr><td style="text-align:left"><a href="/user/%value1%" style="font-weight:700;color:#000">%value1%</a></td><td style="text-align:right">:VALUE(%date%).DATE(AGO);</td></tr></tbody></table><div id="displaybboode">:VALUE(%value2%);</div></div>

Config:

<pid>enter selected forum post id from api data creator</pid><category>post</category><limit>10</limit><page>:GET(page);</page><url>?page=</url><order>new</order>

Footer:

:PAGING(<div class="pagination"> prev %num% next </div>);

Default:

<div class="menu">no post found</div>

Item will be visible for: Admin & user