how can i use a stationery when creating a document

I would like to use a stationery when I create a document or an email.

what do you mean when say “a stationery” here?

If you are looking for templates then the LibreOffice Extensions site can help, as can Apache OpenOffice extensions which might have more templates for personal stationery. Cheers, Al

Thank you. I will look. Cheers, Phillipenter code here

From other questions from OP they want a new default template.