Ok, first of all You must see the word Репутация and after that <<number of respects [percentage]%>>, so for example,
Репутация 0 [0%]
After that, you can see the +/- sign- Click on it.
When the message pops up in a new window, Type in the reason, why u give respect (Reputation) to that member..... AND PRESS THE BUTTON!
Notice: You can only change the respect of each member once.
Ps. if you want to LOWER reputation of a member, you have to Again, type in the reason, but Check the upper Option, (Default one is bottom one, so you need to change it)