I got the base unit working, but I cannot add the two additional units.  The Deco app wanted me to go from one to the other, but after two days, I just wanted to get it working.  Now, I cannot add the other two units.  Online directions say to open the Deco app and click on "Network."  I don't have that available in the app.  When I open the app, I have four choices:  Deco Lab, Monthly Report, Block List, and QoS.

I connected the second Deco to the main unit, and it just blinks blue.  Resetting does not help.  It says AC1200 on the bottom.