You should create a group of 2-3 persons for the project.
To do this go to the Project Groups tab under People: https://chalmers.instructure.com/courses/15174/groups#tab-8043
Here you should (1) join a group and (2) name it to the names of the participants: "Canvas name - Canvas name" where Canvas name is your display names on canvas. For groups of three the name should include all three names: "Canvas name - Canvas name - Canvas name". Look at https://community.canvaslms.com/t5/Student-Guide/How-do-I-manage-groups-as-a-student-group-leader/ta-p/473 if you don't know hope to change the name.
You may form your group however you like, but you may use of the Project Team page to communicate that, e.g., you want a third member in your group, or that you are currently alone in a group.
It is important that you form your group and rename it before the deadline, after which all group modification will need to be made and approved by a teacher.