The simpliest way is to set “Policy” to “ACCEPT” under these chains: INPUT, FORWARD and OUTPUT. I believe you didn’t create custom chains. Also if there are any DROP rules within these chains, uncheck them under “Active” column.
BitTorrent uses a range of ports, so it is not easy to add many rules via [Router] -> [Virtual Server]. Instead I’d suggest you to add single iptables command to startup sequence via menu [Setup] -> [Startup/Cron] -> [NAT and Virtual Servers]:
iptables -t nat -A PREROUTING -p tcp -i ETH01 –destination-port 6881-6999 -j DNAT –to-destination=you.local.ip.address