To find a User ID: Go to "Site admin" → "User Management" → "View all site users", then select the applicable User Profile.

The ID can be found in the browser URL: 

To find a Course ID: Go to the applicable Course.

The ID can be found in the browser URL: 

To find a Group ID: Go to the applicable Course and go to the Course Group Settings (Enrolled Users > Gear Icon > Course Groups).

The ID can be found in the browser URL: 

To find a User Segment ID: Go to "Site admin" → "User Management" → "Manage User Segments", then select the applicable "User Segment" and "Edit".

The ID can be found in the browser URL: 

To find a role ID: Go to "Site admin" → "User Management" → "Assign site roles", then select the applicable role.

The ID can be found in the browser URL: