Can you help me?
Yes, we can. Or, at least we can try. Look on the second screen. When you click "Help" button, you can read something like this: Initially, you will be able to click arrows once. As you level increases, you will be able to click them more times within a single crafting session.
On 40lvl character with 37lvl of alchemy I can click arrows 4 times (I use Brass Mortar without any upgrades). So lvl up your character and alchemy skill, maybe this will help.