Use the accent menu
In an app on your Mac, press and hold a letter key on the keyboard—for example, a—to display the accent menu.
The accent menu for the letter a, showing eight variations of the letter.
The menu isn’t shown if a key doesn’t have any possible accent marks.
Select a character in the menu—for example, á.
You can also press the number key shown for the character, or use the arrow keys to move to the character, then press the Space bar.
Accent marks aren’t available in all apps.