Hi there - new to the forum - hope someone can help

For the life of me I cant seem to get much success in uploading - i can tell people the exact filename of what i'm sharing but they just dont hit me when searching.

When I look at tools/options/bug reports I always show up as a shielded leaf and "received incoming this session = false" which I understand says i'm behind a firewall.

My setup is a Linksys Wireless Router with Firewall turned off, and a Zoomx2 ADSL modem with Firewall turned off (on a network with 2 other PCs). Under options I have "Force IP" enabled

What I don't understand is the difference between NAT and Firewall - the Zoom modem has a NAT configuration screen but I have no idea what I need to do.

Any help gratefully received