Rainbow Username style

[PRÂDÏP]

.
.
1-Upload rainbow.js into your jscripts file in root

2-Go to: Admin control panel> Templates & Style> Templates> your desired template> Ungrouped Templates> headerinclude
add the following code:

<script type="text/javascript" src="{$mybb->settings['bburl']}/jscripts/rainbow.js"></script>

3-Go to: Admin control panel> Templates & Style> Templates> your desired template> Footer Templates> footer
Insert the following code at the very bottom:

<!-- rainbow text initialize -->
<script type="text/javascript"> 
<!--
rain();
//  End -->
</script>
<!-- rainbow text end -->

4-Open:
Users & Groups > Groups > Your group > Username Style
Replace everything in there with:

<span class="rainbow">{username}</span>

5-Enjoy

not working ☹️😭