You can edit your registration in your account, please:
Go to earma.org
Log in to your membership account
Go to your profile and click account
Proceed to the “registrations” at the top right of the page
Press "edit registration", scroll down and click "continue"
Apply the workshops or activities you would like and select "attending"
Approve it and join by clicking “continue”
You will be directed to the registration details, where you can find the Conference and Option invoices.