Every topic in this forum must be categorised by at least one tag. Each tag should contain numbers and letter, separated by a comma or space. If you want to use a compound word the join it with a hyphen. It's better to reused existing tags if you can.
Generally a good set of tags will resemble a top-down hierarchy. By choosing tags that range from general to specific, you lead searchers from the most general categories to your specific post. Unlike a strict hierarchy, the order of your tags doesn't matter.
Use the tag cloud to begin browsing by tags. Tags can be added from the "Add related tags" panel, and removed by clicking on them in the "Tagged with" list. Topics tagged with all the tags you selected will be shown, ordered by when they were last updated.
The RSS button on the same page will give you a feed of the most recently updated topics under your selected tags.
Usually the moderation controls are not shown. When you have accumulated enough karma, you will occasionally see the controls appear under comments. You may promote or demote each comment once. You won't be able to vote for your own comments, or any comments in topics were you have commented.