Embedding pastes is very simple, simply click the 'embed' link and the script tag will be copied to your clipboard.
Want to do it yourself? It's a simple script tag with the embed link, like this:
<script src="http://paste.ee/e/<paste id>"></script>
If you want to limit the height of the container used and make it scroll, modify the url from
http://paste.ee/e/A1B2C
to
http://paste.ee/e/A1B2C?maxheight=<height in pixels>