How do you put the tilde over a vowel?

The tilde (~) is not used to create a diacritical mark over a vowel. Instead, you'd use a different symbol depending on the language and the desired accent.

Here are some examples:

* Spanish: The tilde is used over the vowel "n" to create the ñ sound.

* Portuguese: The tilde is used over the vowel "a" to create the ã sound.

* Other languages: Other languages may use different symbols for vowels with accents, such as the acute accent (`), the grave accent (`) or the umlaut (¨).

If you can provide more context about the language and the desired vowel sound, I can help you find the correct diacritical mark.