New users/Inactive member are somewhat limited for safety reasons. As you participate here, you'll gain the trust of the community, become a full PHCitizen, and those limitations will automatically be removed.
Established members are members that have a few extra features because they contributed something useful to this site. It's actually not hard to become an established member, but it does require some minimal effort.
Basic requirements:
User has posted at least 30 post
User has been registered for at least 30 days
Maintain 5 post every 30 days period to keep your account on Established Group.