Basically, all you have to do is bump in the guild advertisement here:
The Guild Official Advertisement

There is no limit to how much you can bump! Although the bump contest is located in a public forum, only people who are actually in the guild can win =), that's the beauty of it. Not only do we get some publicity for having a guild thread in a public forum, but you could also win some gold!

The prizes are as follows:
1st Post on Page 50: 100 gold.
1st Post on Page 60: 150 gold.
1st Post on Page 75: 250 gold.
1st Post on Page 100: 500 gold.
1st Post on Page 150: 1000 gold!

If you are the first post on any of these select pages (50,60,75,100,or 150), please send a PM to Miname_sohma, and I will send u a trade with your prize. [NOTE: Remember, the contest is at the LINK given at the top of the post, the Guild Advertisement, NOT THIS PAGE]

This contest was funded by your kind donations to the guild mule [this account] via trade request! The bump contest will continue and the prizes will get bigger and bigger once we get more donations and once we get to at least the 100th page.

So help out the guild and earn prizes! What's there to lose?