You can change jobs to a Blacksmith in the town of Geffen. Apply to the Guildsman inside the Blacksmith Guild, located in the 5 o'clock direction of the town, and talk to the person in Alberta to begin the job change test. The Blacksmith quest is similar to that of the Merchant's delivery quest. Once the quest is completed, go to the Guildsman in Morroc to take the final test, and you will be able to change jobs to a Blacksmith. Requirements are Job Lv 40 or higher.