That’s my fault! I’m so sorry, I told you the wrong pin to solder the wire to….it supposed to be pin 4, not 3. I’m so sorry! I was going from memory yesterday when I told you the wrong pin, but after reviewing the schematic I realize that pin 3 is the bypass pin.
The good news is that you don’t need to solder to pin 4 on the microcontroller, if you don’t want to…there is a little via (a little hole through the board) right below R16 (10K resistor) that you can solder the wire to. That may be easier than soldering to the IC pin, but maybe not, now that you have some practice doing that. If you are wondering which via it is, it should be connected to pin 4…just use your continuity tester on your meter to test it.
Good luck and sorry for the bad information yesterday.
-Brach