If HTML has been enabled on your Easy-to-Edit™ website, then you can cut and paste buttons, forms, embed videos, etc. using a simple cut-and-paste with a markup wrapper around it.
Say you have:
<here's my HTML code>
Copy it, type:
Then paste your code.
What you'll end up with is this:
(:html:) <here's my HTML code> (:htmlend:)
If it doesn't work, and you checked that it looks like the example shown here, then contact Criss for help: