Fire TV Cube Condo Setup

Our Florida condo's WiFi network requires a two-step login, first connecting to the WiFi's SSID and second entering a user and password information on a web browser screen.  That's easy enough for a smartphone, tablet or computer that has some version of a mouse and keyboard, but the Amazon Fire TV Cube has neither.  I thought I was stuck until I noticed a "Use Cursor Mode" option (circled in red below) that brought up a mouse pointer that could be moved around, little by little, using the up-down-left-right remote controls to navigate into the input fields and then pressed the circular Select button to select the input field and bring up an on-screen keyboard.

I wish I could include a link here for more details, but there is absolutely nothing to be found on the Internet regarding this option.