How to edit breadcrumb in markerpress

I have added the MarketPress plugin. The breadcrumb looks fine for the store: home->store.
But when you are on any page within the store, like "product", or "category", or and "item", it looks like:
home->product
home->category
home->item
Instead of:
home->store->products
home->store->category
home->store->category->item

Any idea how I can fix this?
Thanks!