How do you spell youst?

"Youst" is not a word in the English language. It's likely a misspelling of one of these words:

* "You'st": This is likely a misspelling of "you'd" (contraction of "you would").

* "Yous't": This is a misspelling of "you'st" which is a contraction of "you used to".

* "Just": This is the correct spelling of the word for "simply" or "only".

It's important to use the correct spelling to avoid confusion and communicate effectively.