Changing header link url address

I’ve pretty much completed my website using themes and plugins from WPMU dev along with the MarketPress plugin, the one problem I have now is that whenever I access my website or click on the “header text”, I’m automatically redirected to the complete products page. I don’t want this to happen, instead I just want users to first access my Welcome page.

Is there an option somewhere to set the address of the header url link and the first page of my website?

Thanks