To send your ACT scores you will need to set up an online account with ACT (act.org), if you don't already have one. If you are trying to send the scores from the ACT you took in 11th grade you will have to do the following:
You will need to call the ACT center at 319.337.1270. Tell them that you are trying to access the ACT scores that you took through school testing in March of 2014, but you did not register under your SSN and you do not know your ACT ID. Also let them know you are trying to sign up for an online account.
In case they ask you, your school number is 344-096. You might also need to give them your home address as verification of your identity.