In the top right corner of anyone's post, you will see this button:
By clicking it, you can approve or disapprove of someone's thread which will eventually change the user's reputation level which is directy under it. Every member has the ability to turn this on or off in their usercp under "Edit Options." Your vote is only one of many factors that can help increase or decrease a member's reputation level. Other factors are how long a member has been registered, how many times they post, etc. etc.
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