Parsec recently added the ability to create a Paperspace machine directly through their interface. This is a slightly easier setup process than creating a Paperspace machine with Parsec pre-installed (see Parsec Template on Paperspace).
Signing up with Parsec
Head over to Parsec's signup page to create an account. Once you've created an account, you'll see an option add a computer.
Click Rent a cloud computer from Parsec to create a machine
Using the Paperspace Public Template
Paperspace offers a pre-configured machine with Parsec installed. You can select this template when creating a machine in the Paperspace console.