Bundle don’t appear un up-sell Settings

Hi, I’ve a probleme : I don’t find the way to customize upsell product for my bundles.

You can see here an example on this bundle :
https://www.goflipr.com/produit/pack-tranquillite-chlore-non-stabilise/

If you click on “Add to cart”, you’ll see your popup with upsell products… but I don’t find the place where I can change theses products : nothing appears in the upsell setting page.

Could you please help me ?

thanks