Click on the Suggestions button on the bottom right of any page. It will bring you to the suggestions for that page. From there, you can click on the All Suggestions button to see all the suggestions (you'll already by seeing these if the page you clicked from didn't have any suggestions itself).
These are things that people are noticing about the site that they think could be improved. Read through some, click on one you have an opinion on, and use the up and down buttons to vote up or down for the suggestion (up if you think it's something the SixLinks Developers should look at soon, down if you think it's not so important).
Completed on June 23, 2009 at 12:36 p.m.