Stroke is the 3nd section in the Advanced pop-up's menu. The Advanced pop-up is exclusive to the Premium Chinese Add-on that you purchase.

Stroke tab

In Characters, you will be instructed on how to write a certain Chinese character.

Giao diện phần CÁCH VIẾT của Pop-up Tiếng Trung nâng cao

Animated: How to write each stroke in order

Practice: Practice writing a Chinese character with right mouse