like the titles say. I use mac OS. I can join group rides but not races?
There shouldn’t be anything keeping you from joining a race.
Some events are split into different subgroups based on w/kg; in these cases you will need to click on the letter pertaining to the group you would like to join (A, B, C, D, or E), rather than just clicking on the word join.
To determine what subgroup is right for you, we have an article on our community page explaining w/kg.
We also have additional information about joining events here.