Using joiningdata/lollipops to make lollipop chart

I’m having trouble downloading and using pbnjay’s lollipop

I went and downloaded the mac version and opened up “lollipops” in the command line. I closed the terminal and then opened it again, and tried:

lollipops TP53 R273C R175H T125 R248Q

but go the following error:

-sh: lollipops: command not found

I also tried downloading go:

go get -u github.com/joiningdata/lollipops

And it was again unable to find the command.

Pretty new to using the command line to download packages, so any help would be greatly appreciated. Thanks