á: press and hold the vowel key, then choose the accented version
é: press and hold the vowel key, then choose the accented version
í: press and hold the vowel key, then choose the accented version
ó: press and hold the vowel key, then choose the accented version
ú: press and hold the vowel key, then choose the accented version
ñ: press and hold n, then choose ñ
ü: press and hold u, then choose ü
Windows: use Alt codes with the numeric keypad
Mac: use Option plus the vowel key for accents
iPhone or Android: press and hold the letter, then select the accented version
Google Docs or Word: use the Insert Symbol or special characters menu
Copy and paste: use accented letters from another source