Write an article based on this "Reach level 15. Kill 7 Mickey the Mice. Go to the Suburbs of Wally’s Castle. Find Hoffman. Talk to him about the quest. Complete the Hoffman’s test. Open your Quest Log after completing this quest."
In order for you to become a Combat Ranger, you must be using Rena as your character and should be level 15 or higher to have the Ranger quest available in your Quest Log.  After completing the Ranger quest, you will be given 3 advance class choices, one will be Combat Ranger. You can find your Quest Log at the bottom right-hand side of the screen. After accepting the Ranger Quest in your Quest Log, go straight to Underground Waterway and kill 7 Mice, but this should be done under Very Hard mode; otherwise, killing Mickey won't be counted.  This can be done in a party. If a party member kills a Mickey, that too will be counted. All you need to do is clear the dungeon in any difficulty mode you want. There's no need for you to have a higher dungeon run grade. As long as you have successfully finished clearing this dungeon, this part of the quest will be completed. Look for Hoffman in Elder Village; he's the Village's Equipment NPC, which can be found at the top right of the map. He will give you the third test. After talking to Hoffman, head back to the Suburbs of Wally's Castle and clear the dungeon again, but this time, under Hard mode. You can invite your friends for a party raid or join randomly with other players. This will allow you to complete your Ranger chain quest and become a full-fledge ranger.