How to list piano accompaniment recordings (for purchase) on work pages

[unicyclingmoose]

Hi,

New to the forums so apologies if I'm not posting this in the right place.

I'm currently building a website to sell piano accompaniment recordings for various pieces, and I've noticed that on a lot of the IMSLP work pages, under Performances/Recordings/Purchase, there are prices and links to another piano accompaniment website where you can purchase an accompaniment recording for the piece.

I'd like to be able to link to my website's accompaniment recordings from IMSLP work pages as well, however I just can't seem to find how to do that.

Does anyone know how to do this?

Thanks,
Peta