It is easy to embed your BRM online booking on a WIX site.

Simply insert an element of type 'code'

your specific code will look something like this - depending on whether you US based or not.

for US hosted sites:

<iframe src="" width="100%" height="1000" frameborder="0"></iframe>

for the rest of the world:

<iframe src=""  width="100%" height="1000"frameborder="0"></iframe>

see also

adding BRM online booking to your site