How do i configure my router to allow ftp transfer?

Assume my WAN IP is 111.222.111.222
Assume the IP of the FTP server on the network is 192.168.2.27

I am using a Belkin Router, there are two areas i see as possible for entering.
1) Virtual Servers - Its asks for the following
1a-Enable/Disable - has simple check mark
2a-Description - has simple text field
3a-Inbout Port - has two boxes with a ~ in between
4a-Type - Either UDP or TCP, both is NOT an option
5a-Private IP Address - 192.168.2. the last box needs input
6a-Private Port, it has two boxes just like 3a

2)Application Gateways
1a-Trigger Start Point-single box for port entry
2a-Trigger End Point-single box for port entry
3a-Trigger Type-TCP or UDP or BOTH
4a-Public Port - This has a large enrty box
5a-Public Type - TCP or UDP or BOTH
6a-Enable/Disable

I am running Serv-u ftp server on the
192.168.2.27 machine.

also, the person addressing the ftp server, what is the proper syntax
ftp://111.222.111.222:21
?
Thank you very much for helping
Do i fill out the Application gateways or Virtual Servers section. again, thanks for helping