Kathy, I think I have figured out "reputations". At the bottom of a person's comment, there is a green + and a red - sign. People click + if they like/agree with the comment. They click minus if they don't like/disagree with a comment. The reputation tallies the number of pluses and minus. If you have positive numbers in the reputation, all is good (and the higher the number, the better). If you have minuses, well...
If enabled, you will see reputation options in the corner below each post. You may see an icon representing the reputation other members have given for that post, along with icons to give reputation. To give the post a positive reputation, click the
icon or to give the post a negative reputation, click the