You should be able to use the code "[s]>{param}[/s]"
Let's test it: [S]
HTML Code:
<s>stuff that aint valid anymore</s>
Ok, disregard...guess I don't know what I'm doing.
I think it has to be added by the administrators maybe. Ya, HTML code is off, so you have to use BB Code..and if you click on BB Code in the posting rules, on the bottom left of screen, it shows you all the allowed bb codes.