Error in TTMIK course (Every TTMIK lessons (levels 1-10))

There’s an error in one of the phrases in Level 1 of the TTMIK course. In lesson 12 it says 저 케익 맛있어요 (That cake (over there) is delicious). However, cake is spelled 케이크 and not 케익. I don’t know how to contact the creator about this. Does anyone know how to do that?