They don't have a lightning address set.

Their donation page says to just donate to nostr:nprofile1qqs8suecw4luyht9ekff89x4uacneapk8r5dyk0gmn6uwwurf6u9ruspzpmhxue69uhkumewwd68ytnrwghszxthwden5te0wfjkccte9eekummjwsh8xmmrd9skctcpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhs2juazd but there's no way to direct funds to them specifically