Sure no worries, its pretty simple aha.
A quick TinyMCE (with CDN) tutorial:
1) Shove this into your page, just before the </body>
tag if possible
<script src="http://tinymce.cachefly.net/4.1/tinymce.min.js"></script>
<script>tinymce.init({selector:'textarea'});</script>
And here you are, done! You'll have the default one going, so if you want to snazz it up a bit or change the settings, just alter the bit inside tinymce.init({})
bit.
All it does is changes the look of your textarea, and submits HTML code instead of plain text. So all it is doing is helping your user add HTML to their textarea, if that makes any sence.