How do you do the i with two dots?

The "i" with two dots is called an umlaut in German, represented as "ï." To type it on a computer, you can usually hold down the "Alt" key and type "137" on the numeric keypad for Windows. On a Mac, you can type "Option" + "u," followed by "i." Alternatively, you can use the character map or special characters menu in your text editor.