Once your Rena reaches level 15 or higher, the Ranger quest will be available in your Quest Log. The Quest Log can be found at the bottom right-hand side of your screen (the exclamation point icon). A window will appear showing a list of on-going and available quests.  When you open your Quest Log, make sure you're in a city or town to avoid being attacked by monsters. The Quest Log can also be opened by pressing Q on your keyboard.  Head straight to the Underground Waterway, under Very Hard mode, and kill 7 Mickey the Mice.  This can be done in a party. If your party member kills a Mickey, that too will be counted. To get in a dungeon, simply press the Dungeon tab found on your screen. This will open a window showing you the available dungeons for your level. Click on the dungeon you want to enter and then press Start Dungeon, or hit F8 on your keyboard. This will automatically assign you to a party, but if you're already in a party, choose “Start with current members” instead. To change the dungeon difficulty, after choosing a dungeon you want to enter, look at the menu to your right; you will see the description of the dungeon as well as the dungeon difficulty. Choose from Normal, Hard, and Very Hard. Keep in mind that the higher the difficulty you choose, the more stamina is consumed per run, and this also requires a full party to clear the dungeon, depending on the dungeon level. After completing your first quest, go and clear the Suburbs of Wally's Castle. Complete the dungeon on any mode. He's the village's Equipment NPC; he can be found at the top right of the map. Talk to him about the quest, and he will give you a third test. You can invite your friends for a party raid or join randomly with other players. After completing this quest, open your Quest Log to complete your Ranger quest and become a full-fledge Ranger.
Reach level 15. Open your Quest Log. Find the Ranger quest in the list and accept it. Kill 7 Mickey the Mice. Clear the Suburbs of Wally's Castle. Look for Hoffman in Elder Village. Clear the Suburbs of Wally's Castle under Hard mode.