First volunteer to review for alt.chi here:
You should then see a page with a "conflicts" link (ignore it) and a "bidding" link here:
The bidding page can be directly accessed from the link Chat sent:
After some time you should receive emails with invitations to review the papers for which you selected "want".
There has been lots of issues with PCS, so if you have any problem email the chairs at alt...@chi2019.acm.org
. Actually I would strongly suggest emailing them directly after you placed your bids (with a screenshot of your bids or a list of paper IDs you want) because in many cases, they're not able to see what people bid!
Deadline is 21 January but posting your review earlier is recommended to allow for discussions. Your review can be very short.