do you try to join kakao plus friend?
enter your name (unchangeable)
select country code from drop down list
enter your mobile number (used for kakao) then click the right button (인증)
enter the verification number you received via mobile then click the right button (확인)
then check the first line (모두 확인, 동의합니다) only
(once you check this one, then it is equal to check 2-4th lines at once. if you want to join this plus friend service, you must agree all items)