On this page https://github.com/BelaPlatform/bela-pepper/wiki/Building-the-Module it says that the "The text of the regulator should face towards the bottom of the PCB." I'm not sure what this means? Is the bottom the other side of the board or the bottom where the buttons are? I'm assuming the buttons as the square (12v) pad should be the input to the regulator according to the datasheet https://recom-power.com/pdf/Innoline/R-78-0.5.pdf.

There is a little engraved dot on the front of the regulator (where the text is). That goes in the pin that has a square. As a result, the text on the side of the regulator will face down (towards the ground when the PCB is vertical, with the regulator at the top). It should probably be made clearer in the wiki.