What do i have to do to not be a junior member? Does it effect anything if i am a junior? or is junior the only thing other than administrator? Please answer.

its just the naming convention that is put under names based on the amount of post they have.
Premium members have the ability to change that to a custom name.

You are a total n00b and i sp4nk u incredibly h4rd. It will leave red welts. ooooooooo

now thats funny