Technicolor router firewall

[#1]

Hi All
I have tried to change my routers firewall settings to high using the settings on plusnets web page.
I disconnected the router as instructed but the actual settings on my router remain the same as before?
What am I doing wrong?
Also GRC shieldup says I have open ports

Thanks
Andy

[#2]

Plusnet's webpage is for the Plusnet firewall not the routers firewall
which router do you have
if it is theTG582N this is where you change it http://192.168.1.254/cgi/b/secpol/ov/?be=0&l0=3&l1=6

[#3]

Thanks for replying
I have already changed settings on that page so maybe the open ports are due to the router not closing them as expected.
What does the plusnet firewall do?

Andy