The first thing that you'll want to do is go to the "Logs" folder in World of Warcraft and delete the WoWCombatLog.txt This will clear out any information that you may have had in there before, and help to not cause issues with the WoL Uploader
Next, In game, you'll need to tell WoW to start recording all of the combat logs. This is a fairly simple slash command (it's also a toggle) /combatlog will turn off and on the ability of World of Warcraft to record your combatlogs.
Now, the most fun part of the adventure, fighting the bosses! Wow turns off combat logging whenever you log out, so if you are recording fights, and get disconnected, please remember to turn it back on!
After you've finished for the night, you'll want to go to the WorldOfLogs website and click the "Client" button. I usually just "open" the Java app, instead of saving it.
After you've made sure that all of the correct information is in the boxes, you can close out of the Preferences box, and click the large square in the middle of the client. This will take you to the page where you'll be making sure that the information is correct before you send it off to the WoL Website.
Here, just make sure that the Times are correct for your raid, if you feel that you have some extra at the beginning or the end, you can drag the blue highlighted section at the bottom over the areas that you want to be included in your report.
http://raidbots.com/comparebot/ All you have to do is paste in the dashboard URL of that nights fight, and let it run. You'll be able to see where potential flaws were made, as well as some of the significant class skills that each person used!
Good luck everyone!