Thanks!
Edit: how do i install it?
I am not sure how to do this step
As we all know, MyBB ships with Prototype as it's core JS framework (unless you've somehow got hold of a 1.8 build...). I personally prefer to use jQuery and as such it's the default library of choice for MyAlerts. I understand, however, that a few people don't want to load jQuery too (looking at you Leefish). As such, I've included a Prototype version of the MyAlerts JS. To make use of prototype, edit the headerinclude and remove any mentions of MyAlerts then add the following below your other JavaScript inclusions:
<script type="text/javascript" src="{$mybb->settings['bburl']}/jscripts/scriptaculous.js?load=effects"></script>
<script type="text/javascript" src="{$mybb->settings['bburl']}/jscripts/myalerts.prototype.js"></script>