There are three possibilities you can share your project with your team members:

1. By using the “Share” option from the “Share” menu;
2. By clicking on the Share Project button from the Share bar that appears immediately after opening a file;
3. By going to the File menu – Open – GoogleDrive and in the file picker, right click on the project you want to share and choose “Share” option;

Then, just type the E-mail address and a message and click on one of the three options available in the Share Projects with the Team Members dialog: Copy Link, Send as PDF, Send as MPP. Then, click on the Share Project button from the dialog and the E-mail will be sent to the added e-mail address.