Hi Elsie
Thanks for reporting the bug!
The problem was that the GERBER files had not been updated since an earlier version of the board.
I fixed this with a repository push.
In the version you have, the trimmer potentiometer controls the amount of current passed through the infrared emitter. In the newer version, it controls the amount of current passed through the port LED. Otherwise there is no difference.
Fortunately, Marks building has a nice library of through-hole resistors on the second floor - so you should be able to find the right values for the boards you have.