After registering an account, BidSync sends a verification email to the address used to register. In this email, a link is included which has a unique verification token to continue setting up your account (see how).
It is possible for this email to be delivered to a Junk or Spam folder. If unable to locate it, to reissue an email, go to the login page at https://prod.bidsync.com/bidsync-login/:
Select the Orange login for Basic/Pro and click "Forgot your password?" at the bottom
Enter in the email address used to register and use the provided link to continue setting up and verifying your account: