I already did a quick google. Always do before asking here. Your page says to use hash character # for comments like this.
# This should be a comment but it does not work.
Unfortunately, Berkeley Logo must use some other syntax. This morning a search including "Berkeley" gave me a page which said to use an apostrophie. But unfortunately...
' This does not work either.
Howevre, in class we got online and found another page which said to use a semicolon...
; Whad'y'know - it works!
Never knew a language like this would have so many variances depending on the version.