In French, the verb vouloir is used in L'Impératif Présent in a very specific manner.
Learn how to conjugate VOULOIR (to want) in L'Impératif Présent in French
As you can see, we only ever use the vous form.
Note that literally, veuillez would be similar to be willing to, and is therefore used as a polite and formal way to ask someone to do something.
-> Be willing to help me = Please help me = Veuillez m'aider
Not to be confused with the regular conjugation veillez from the verb veiller (to be watchful).
See also these other lessons on L'Impératif Présent:
Conjugate regular verbs in the imperative mood in French (L'Impératif)
Conjugate irregular être/avoir/savoir in the imperative mood in French (L'Impératif)
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