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?