I can never remember this. I’m putting it here so I’ll know where to find the instructions. Just ignore if you’re not interested.
Cedille: hit “option” “c” to get ç
Áigue: hit “option” “e” – then “e” again to get é
Grave: hit “option” “~” [tilde] let go, then “e” to get è
Circonflexe: hit “option” “i” let go, then “e” to get ê
Useful link