UBB.threads PHP Forum Software Community Forums UBB.threads 6 Version 6 Support Help! how do I enable cut and paste availabiltiy

That's HTML code, which you probably have disabled. Keeping it disabled is a good idea.

You instead need to use UBBCode - [ img ]http://smileys.smileycentral.com/cat/7/7_2_116.gif[ /img ] (only without the spaces)

That would render as:

[]http://smileys.smileycentral.com/cat/7/7_2_116.gif[/]