To access your personal online dashboard and activate your account, please login here with the email address and password for your SumUp account.
After you have successfully logged in, you will see this message at the top:
Please then click on "Activate". As shown below, you can now enter your mobile number in the field and click on "Request code".
Within a few seconds, you will receive an SMS with a 4 digit activation code. Please enter the code in the corresponding field and click on "Confirm code".
Now your SumUp account is activated and you can start to accept card payments.
By the way: Here you can find an overview of the Online Dashboard.