Make sure you have your LastPass account setup before activating your Hudu account.
Wait for your welcome email and when you recieve it, click on the link to Start setting up my account →

Enter in your name and create a strong password. When done, click the Complete Registration button to continue.

Scan the QR code with your LastPass Authenticator app on your mobile device and enter in the code in the space provided (in LastPass, the code will show under ComputersDOTCalm - you may want to edit this label). When done, click the Activate 2FA button to continue.

If everything looks correct, click the Return to Dashboard button at the top to log into your Hudu profile.