Does anyone know how to change the citation style in Mendely in order to sort the references according to the order of citation in the paper? So that in the text is displayed only the number (eg. [1]) and not the name of the authors?
If you are using Mendeley add-in in Word you must select the style in a list that is in the Mendeley Cite-O-Matic menu (I have used IEEE style and works as you want).
If you are using Mendeley to generate a Bibtex file in LaTeX, you need to use an appropriate style using \bibliographystyle{stylename} (stylename = unsrt works for me). You do not need to change anything in Mendeley to get your desired Style.