Before you proceed, you need Spaces installed on your phone.
How to set a member as Admin/Owner/Member?
Step 1 - Open the Space for which you want to set member as Admin/Owner/Member.
Step 2 - Navigate to the Members Tab.
Step 3 - In the members' section, Click on the member you want to remove.
Step 4 - Click on Set as Admin/Owner/Member.
Step 5 - It would open a confirmation screen, Confirm.
You are done!