Welcome to the quagmire and Happy Thanksgiving. A year ago, I was at the same place (more unsure of myself than slow which is probably true for you.
I just answered this yesterday on the main thread, so easy here (copy/paste).
To select a location, you do the following (each time you log on:
a. Log onto the IDE
b. Select the tab “My Locations” It will look similar to the below (your name instead of mine).
Name Events Notifications Devices Installed SmartApps
DGutheinz events notifications devices smartapps
c. Select the location name (for me “DGutheinz”) (i.e., click on the name)
This will cause the a new page with the location name at the top (I.e., “DGutheinz”). You have now selected your location. This is what is meant by selecting a location (some users have multiple locations (i.e, their house and their parents house) that they manage, therefore the necessity.
After you do this, follow the instructions carefully.
good luck and keep in touch if you have problems. Slow response, but we will get there!