In order for you to create a weapon or armor, you need to have the recipe. Recipes for advanced armor and weapons are dropped from dungeon monsters and bosses.  Once you have obtained a recipe and used it, the knowledge will be shared with all of your characters within the same account. To learn recipes you found as drops, talk to the Blacksmith in Navea, select "I want precise casting and forging", and drag the recipe from your inventory to the Special Recipe slot in the window. Click on the Pay button to learn the recipe. To learn recipes, talk to the blacksmith in Navea and select the dialogue option "I want precise casting and forging". This will open the crafting window. You must be level 40 or higher in order to learn recipes from a blacksmith.  The crafting window will show you a list of recipes you already have. Click the "Learn Recipe" to have it registered and ready to use. Recipes that have been learned will appear in the refining window.

TL;DR in Indonesian:
Dapatkan resep dari dungeon. Belilah resep.