The specific steps to unbind the health card by WeChat are as follows:

1. Open WeChat, enter the health card in the search box, and click Use under the applet used.

2. Click the health card that needs to be unbound.

3. Slide the page down and click Unbind this card.

It should be noted that you will not be able to use this health card after unbinding. If you need to use it again, you need to rebind it.