From the Sitelink3D v2 site
Log into Sitelink3D v2.
Select the drop-down menu under the site name, and click Site Information.
Enter the Discovery ID that your site populates into your Haul Truck app, along with the PIN you created for the site.
Click the menu icon.
Enter the site ID and access code that was created for the site.
Complete the rest of the setup process.