Go to SPACE ID Scroll down and choose to whom you want to delegate. The domain name search function is not working yet, so you need to use the wallet address search. For example, you can enter my address in the search field (0xAFe934d660C157b7622cAD704BCd910972ccA72B), and it should be shown me.
Please read this answer: Space ID Dao Delegation - #9 by xandry.bnb