@David-TP Thanks for the response.  I have looked at/used the app, in fact I went to the webpage because I couldn't find the funcionality in the app in the first place.  

Have looked through the app overview stuff you linked and I still can't find the advanced features I'm looking for.  In particular, the main one I'm trying to figure out is how I can 'lock' an IP address to a device so it never changes.  Is that something I can do?

  @Alexandre. Thank you that worked.  Solved my immediate problem.

 Honestly the simplistic web admin UI is just lame. Having to use a mobile app to do complex stuff like setting up port forwarding etc.. is difficult, tedious and error prone. Moreover most of the details we want to put in there will be in a PC not on the mobile device, so we have to do double handling of information from one device to another to get these things setup.

Do better and just give us a normal router web admin interface instead of forcing people to use silly apps.