Proteus is cloud-based, so getting access is as easy as going to the Pricing page and clicking on the Create Account button. If you are a freelancer you create a profile and you can view projects in The Marketplace.
If you represent a company and want a company account this is also simple. You can signup, enter the company details and off you go. We will contact you after this to make sure you are getting Proteus optimised for your company.