@chloroformus

Let me try -

1. Rep+ button (Yellow Color) is below every member thread / post
2. Green bars indicate reputation attend by member from 1-1000 (it reset once user cross 1000 rep to start over again till next 1000 rep). You can check your current reputation point under you avatar (which is 88 points right now) below it there is reputation power - whenever you add any member rep+ then now much point will be get added to that member (which is 1 point your case, mean if you add rep+ to any member having 100 reputation point then it will increase to 101 but if I add rep+ to that user than it will raise to 195 points as mine rep power is 95)
3. For now maximum reputation power is 100 for which approx 8000 reputation points are required ( Hope I reach 8000 soon ). Admins can give more than 100 Rep
4. For every 1000 rep there is star (max of 3000, mean 3 stars) as you can notice mine.

Hope I'm clear, still if you require more details feel free to ask