@markrichhe 

In reference to the setup here: https://www.tp-link.com/us/support/faq/1373/

I believe you are talking about step 3, this is the password for the local log-in of the extender or what you would use to log into the extender directly. The later steps will ask for the wireless password of your existing wireless router (Step 4).

@markrichhe 

I'm having the same issue where I'm trying to log in into the extender network and once I input the password that I just created it says that it's incorrect and I don't know how to reset that password. Any ideas on how to bypass this? Without me being able to connect I can go any further in setting it up