I am running with ubuntu 20.04 (linux)

I have a tp-link model: tl-wr940n and I am trying to set it up.  So far its been a disaster.  I made a run at it and suddenly it told me I had tried too many times and I had to wait 2 hours.  My problem was that I was getting asked questions and I had no idea how to answer them.  When I tried it told me I was wrong.  That dance went on until it didn't.  Oh, when I answered one with the right answers it just skipped to another before it threw me out.  Then I read everything I could about this thing and tried again.  As I was trying to get to the questions it suddenly showed me the tp-link network that I could selecty for my internet access.  The problem is that there was nothing in it, as far as I could tell.  I was wondering what it was giving but my wifi took it.  Then I tried the internet and nothing happened.  It said it had an excellent connection but no internet. 

When I hooked it up I wasn't sure where to the connection from the main router (ARRIS SURFboard SBG6900AC Docsis 3.0 I think)  I currently don't have it in the single blue spot but in one of the 4 orange places.  When I had it in the single blue one it seemed to me that it was somehow messing with the network and I lost the internet until I turned it off and re-started my system router.  I REALLY need some help.  My thought is to reset it back to it was and start over.  If I ever get back to that place in http://tplinkwifi.net/ I need to know just what they are asking for in the 2 (that I experienced, there may be ore) questions about names and passwords.  All I wanted to do was to move my house wi-fi past one wall with cable and then let my tp-link send out the network stronger than my router so I can get a little more speed. 

Any help would REALLY be appreciated.

Thank you..........