With the reputation you gain by participating on the website and game, you can buy different rank tiers for OP (Outpost Police), TL (Trade Lord) and EB (Expanse Bureau).
Ranks qualify you for different activities and duties, and let you create guilds and factions.
You gain reputation by playing the game, being active on the chat, forums, and being a member of units, factions or guilds.
You can spend your rep to gain ranks on demand. Each rank level has a reputation price, and you can only get it if you already got the previous rank in that progression.