Once you're a Traveler, the wizard's final step asks you to link your Minecraft account. This is what gets you onto the Lighthouse server -- linking your account adds you to the whitelist automatically, so you can log in and start playing.
Click Connect Minecraft and you'll be taken to your account settings to complete the process. For a full walkthrough, see Linking Your Minecraft Account.
If a parent or guardian has turned off Minecraft access for your account, the wizard will show a message explaining that. Click Continue to finish your account setup. If your parent later enables Minecraft access, you can link your account from Settings.
You can skip this step and do it later. Click Skip for now and the wizard will mark your setup as complete. You can link your Minecraft account anytime from your Settings under Minecraft Accounts.
Once you link your Minecraft account (or skip the step), the wizard is finished. A "Welcome to Lighthouse!" screen will appear with some suggestions for what to do next:
The welcome screen also includes a link to your notification preferences so you can set up how you'd like to hear from us. Click Get Started to close it and see your full Dashboard.
As a Traveler with a linked Minecraft account, you now have full access to the community:
Welcome to Lighthouse!