Notice that the sentences above all have the past tense marker 었 attached to the stem of 싶다 (as in 싶 + 었 + 어요 = 싶었어요) or 싶어하다 (as in 싶어하 + 었 + 어요 = 싶어했어요).
To express the honorific meaning, the honorific suffix -(으)시 is added to the stem of 싶다 (as in 싶 + 으시 + 어요 = 싶으세요).