how to add a second release date?

Hi,

Our docu series THE OFFENSIVE has been sold to different countries. I'm trying to figure out how I can add these extra release dates (on top of the initial, local release date) to our IMDB-page?

In comparison to other IMDB-pages, it seems impossible to add extra dates to this page? I have been trying several options already.

This is our page: https://www.imdb.com/title/tt13322788/?ref_=nv_sr_srsg_0 

Thanks for your help.

Kristoffel