Simply navigate to the Mods page and click the Run Mod button next to the desired mod. You will be asked to confirm your selection before running.
That’s it! Once you’re back to the Mods page, you’ll notice that the mod you selected to run has a new status indicator. A mod currently goes through the following stages:
Click the View Logs button next to the appropriate mod to view all logs for your mod. For more information on logging as well as judging mods, read Mod Logs.