Driving Webpage with chromote

I cannot figure out how to fill out the username and password boxes programmatically using R (trying to use chromote) for this website: app.feedstation.net

I understand that no one else will have a username and password, but can someone please share some code that will fill out the username and password boxes with the string 'foo' and that will then click the Sign In button?

This website houses 20,000 + xml files of proprietary data that belongs to my company and I need to be able to download it. Doing it by hand isn't feasible.

Thanks in advance!