No stupid questions… except for the ones you don’t ask 
For your “can’t enter text into the project name field issue”:
Re: installing your board - you don’t need to install the board, just the platform. Installing the platform (Nordic nRF52 v3.8.0) installs support for all the boards listed. You can then pick Nordic nRF52-DK from the new projects wizard as you’ve found, or use board = nrf52_dk in the platformio.ini as shown in the PIO documentation for that board.