You should post messages regularly. By doing that, you will increase your activity. You will be Jr. Member when you reach 30 activity. After that, when you reach 60 activity you will be Member. After being Member, you will need merits from other people to increase your rank. Activity will not be enough to increase rank.
Absolutely wrong ,this has been the pattern wayback before the Merit System take effect but these days?not unless you purchase a CopperMembership you will never ranked up without Merits sent to you ,even that you have a thousand activity points but no merit still your rank will be newbie ..
To OP,try your best to help others and with that knowledge youll increase the merit received and may ranked up sooner