what do those green bars above your avatar mean??

<<^^what do those green bars above your avatar mean?? how do you get more??

https://www.rollitup.org/support/82082-experience-system.html .... https://www.rollitup.org/support/8443-user-ranking-system.html ..... https://www.rollitup.org/support/29103-rep-system-information.html

Thanks BB now I know