Please follow these steps to start designing with Phi:
Log onto Onshape, and visit the Onshape App Store. You will find Phi in the "Design & Documentation" category:
Click on "Subscribe". You will be asked to re-enter your password, and you may need to accept terms and conditions. You may also need to log out and log back into Onshape for the subscription to take effect.
Create a new document or open an existing one:
Once you open the document, click on the + sign at the bottom left, and then click on the Phi application:
A new Tab will open at the bottom of your document, click on it and start designing in Phi!