There is a object called animation, drag it to the header then double click it. (step2 template customization)

That should be it

How do I save the animation in webanimator in the .wax5 format??

sorry .. that way.

I don't have it but here is how it's done:

https://helpcenter.websitex5.com/post/108793

Here is also some help: http://www.webanimator.com/en/support.html

Hope it helps