Have a look here for info about how to share folders
How to Share Folders (click on link)

If you think people aren't able to download from you, check to see if you're firewalled. Do you see the firewall icon (brick wall in front of the blue globe)? If you're firewalled, people will usually have trouble downloading from you.

In LW go tools > options > bug reports > view example. Scroll down to 'recieved incoming this session'...is it true or false? If it's false, your computer can't recieve incoming connection from other computers (ie other users). This is most often due to a firewall problem & sometimes due to an ISP limiting uploads.

If you do have a firewall problem, here's where to start looking
Connection problems? Check here first!

And if you're stuck or lost, give us your details
System details - help us to help you