tuto installation WM8960 card (stereo amp hat) for volumio

hello Every body,

If someone can help me or to install this card with volumio or tell me where i can find, thank a lot.
i find this topic
waveshare-wm8960-t12241.html#p76636
but i dont find how i can extend the boot partition (no raspi-config on volumio by ssh, any aothers commands?)
thanks