Does not work- waste of time

I have installed the plugin on 4 different site and none of them work, I have it on one site no other plugins so no conflict there and it still will not connect. I can not find any information or help on what to do. What a waste of a day, researching and still can not get it to work, I also set up an account on hubspot and could not even get the email section to connect, it should not be this hard.