在applyweb上看到了GIT的decision letter，上面写着“A "Complete Your Decision" button will also appear in the CollegeNET portal where you can either accept or decline this offer of admission for Fall 2016.
That’s correct. It appears that Graduate Admissions is still processing the many decisions, so it should just be a few business days until the button appears.
However, if works with you , I will use the email below as confirmation of your acceptance and will update your profile accordingly. Please confirm is ok to do so.