Welcome to myCommunity and thanks for posting!
To access your CoE (Confirmation of Enrolment) through enrolment online:
1. Log into myRMIT
2. Select the enrolment online link, then
3. Select My Student Record button
4. Under Enrolment details, select View Confirmation of Enrolment (CoE)
More information can be found on the RMIT website at the below link:
I hope this helps!!