Follow this link: https://www.hiexpress.com/redirect?path=hd&brandCode=EX&localeCode=en&regionCode=1&hotelCode=THIVR&_PMID=99801505&GPC=lww&cn=no&viewfullsite=true

It should autofill with the group code but in case not, it is lww. Just select the dates you want to stay. Please be aware that after March 24th the group rate will go away so if you want the discount please book by then!