1) Objects > Services
Add services:
TCP service named tcp-4662 with destination 4662, keep source by default
UDP service named udp-4772 with destination 4672, keep source by default
Add service group named emule = tcp-4662 + udp-4672
2) Rules > IP rules
SAT wan/all-nets core/wan_ip emule (SAT: new destination = your local IP)
Allow wan/all-nets core/wan_ip emule