How do I contact the members of my group?

In the Group Workspace, under People, you can see who is a member of your group (see screenshot). You now have several options to contact the members of your group.

[Email] Inbox: Go to Inbox in the Canvas navigation bar and select Compose New Message. Under Course, scroll down to Groups and select Course. Click a group. Click the Address Book icon to see a list of all the members in that group. You can now send a message to all of them at once (All "Group name") or select individuals. By default, messages are also forwarded to the email addresses (see: Inbox in the Canvas WU Guide).
Announcements: Click on the announcements at the top to send a message to everyone in your group. You can also embed files or spontaneous audio or webcam recordings (see Rich Content Editor in the Canvas WU Guide). Messages can be forwarded to email addresses.
[Post] Discussion: Under Discussions, click +Discussion and name the discussion something like "Getting to know each other" or "First meeting" or similar. Anyone in the group can join the discussion. Posts can be forwarded to email addresses.
Calendar: Under Start, go to View Calendar to the right of Coming Up, or access a group's calendar directly under the Calendar in the left navigation bar of Canvas WU. Select the plus sign at the top right to add a new event. This will be visible to group members on the calendar and in the group workspace. Information about calendar events can be forwarded to email addresses. For example, you can schedule a face-to-face meeting on campus.
Zoom: In the Group Workspace, click Collaborations, select +Collaboration, and then select Zoom. From here, you can schedule or immediately start a Zoom meeting to discuss with all/selected group members via web conference (see screenshot).