The Title says it all! How do I become a host?

Just by having your computer connected to the Gnutella network, that makes you a host/peer. The files in your shared folder are available for others to d/load from you. Lime Wire » Glossary - Host/Peer

Try these links for more info:

Lime Wire » LimeWire User Guide

Frequently Asked Questions - LimeWire

User Cant Connect - LimeWire

Lime Wire » Glossary

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If it ain't broke, fix it till it is!

Truly, you are indeed a Grand Moobulous Paculous. I now pronounce you a member of my coolerati, to sit on my coolitariate!

But now I have another question. How come when it asks if I want to add a host, it asks me for my number, which is many groups of numbers separated by dots and stuff?

LISSA25

That number is an ip address. If you know of good & reliable ultrapeers to connect through & know their ip's then you can add them in that window.
An ip address is usually 4 blocks of numbers. eg: 106.201.84.31
ip addresses that start with 192 or 10 are always network numbers either from home or at work (& are not properly configured). They are impossible to use the LW direct connect function with. Not sure how they behave as ultrapeers, but safest not to choose one of those.

Thank you oh Great One! But I am now wondering, why would you want to connect through an ultrapeer, when you can connect without one?

Lissa25

You can only connect thru ultrapeers. If you turn on the connections window & have a look, all those connections you see are Ultrapeers. LW Basic connects thru 3 ultrapeers, LW Pro connects thru 5 UP's which allows a slightly improved search for the rarer to find files.

If however you are running as a T3 connection you can connect to more.

But as the topic of the thread suggests, you are wishing to host, which means sharing files. You can do that in a few ways. One is via partial file sharing, another is sharing finished downloads, another is via adding your own share folders.
eg: some iTunes music folders. How to Share Folders (click on link)