All crafting trainers are located in the same general areas. In Pandaemonium (for Asmodians), go to the Temple of Artisans - the green section on the right side of the map just north of the Brokers and warehouse/bank. For Sanctum (Elyos), go to the north side of the Divine Road to the Artisan's Hall.
All of the crafting trainers are in that green area of the map and the Armorsmithing trainer is at the southeast corner of that area. Simply talk with the crafting vendor of your choice. You will be given a quest to gather a material used by that craft in order to prove your interest in the craft.
Once you complete that quest, talk with the NPC again and they will give you the option of training in that craft. B. More.
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