A few things happen the first time you login to Trimble Connect. First, a prompt appears asking you to set up your Trimble Connect profile.  You can fill out any of these fields right now, or can fill them in later. Clicking continue will open the Projects page. 

Trimble Connect is a cloud-based common data environment (CDE) and collaboration platform designed with the construction industry in mind. When it comes to SketchUp, Trimble Connect can help organize projects, help teams collaborate on models, and easily share SketchUp models with stakeholders. Every SketchUp subscription provides access to Trimble Connect and includes unlimited cloud storage.  Take a look at these articles to help you get started using Trimble Connect with SketchUp: 

Trimble Connect is a cloud-based common data environment (CDE) and collaboration platform designed with the construction industry in mind. When you use Trimble Connect with SketchUp, you can organize project data, preserve version history, and share models with stakeholders. SketchUp subscription plans include access to Trimble Connect with unlimited cloud storage.