To access the Alchemy Bank, simply head toward the Crafting teleport in the main city temple, as shown in the image. After entering the teleport, just go down the stairs, and you will be at the Alchemy Bank.
Interacting with the alchemy station will open a window that contains all the possible recipes available to craft, along with the required materials for each recipe. Each recipe requires a certain amount of BlackTalon Coins, the main currency of the server, as well as Gold.
In addition to material costs, the recipes will also require a certain amount of crafting skill to complete. This means that as you craft anything within alchemy, you will gain experience for the Alchemy skill. You can see your current crafting skill progression on the character information panel, as shown in the image.