I really can't answer that, because it is a router specific question and there are hundreds of
different routers on the market.
All I can say is take a deep breath and carefully look at you router settings, since it must be in
there somewhere.
Worse case, I would be happy to take a look using Teamviewer if we can arrange a time. It would
be best to contact me directly at dj0qn (at) darc (dot) de to arrange something if you can't find the
problem yourself first. I am at my Florida QTH this time of year.
73,
Mitch DJ0QN / K7DX