This video shows you how to configure PPPoE Server in Mikrotik less than one minute
Step by step you have to do:
1. Configure IP Address on interface: in this example I use IP 10.11.12.1/24
2. Create IP Pool for PPPoE clients: I use for example 10.11.12.11-10.11.12.200
3. Create PPPoE service that point to the interface configured in step 1
4. Create profile for PPPoE clients
5. Create Secrets (username and password) for clients
PPPoE service commonly uses in ISPs for their broadband / residential customers.