Assuming you are in Internet Explorer, if you refresh the page and it still brings you to the Welcome to the ProfitCents QuickBooks Integrator page even when you click on I've finished installing.
It's highly likely that your internet explorer has certain Active X filtering turned on.
Make sure it's checked>Gear Options Icon (top right hand side of your browser)>Safety>ActiveX Filtering
If it is checked, un-checking it & refreshing the page will reactivate the integrator.