Once you have an Audigo mic, you can manage your account by visiting https://account.audigolabs.com and logging in with your email and password. You can then add a Studio or Pro plan.
If you have not already had a month's free trial of a plan, when you add a plan your first month will be free.
For Canadian customers, if you do not already have an active billing account setup (i.e. you received Audigo as a gift or are using a different email address than the one used on the original order) please contact support@audigolabs.com for help with managing your account details.