Sim activation or new Sim?

HI Smarty, i have no idea how to contact you based on any of the links on your website.  I tried to activate a Sim I'd been given but your system only enabled me to order a new Sim...  This might be user error on my part but it wasn't clear so now I've got to wait two days for my new Sim to arrive rather than using the one I have - any ideas how to put this right???