Step 1: Select the preferred citation style in the drop-down menu in your word processor.

Step 2: Make sure your curser is at the end of your document and click "Insert Bibliography".

Step 3: Customizing a citation style
If you can't find your style in the "get more styles" option, you can customise an existing style.
A useful guide on the different ways to customise can be found on the Citation styles website. Please note that this a technical step. It is strongly recommended that you should rather use the styles provided by Mendeley.