Once you have your documents and references in Mendeley, you can cite and reference them within Word and OpenOffice by installing plug-ins. Once installed, you will have toolbar buttons that will allow you to cite a document, generate a bibliography, or manually edit any entry.
In Mendeley Desktop go to Tools > Install... and select the plug-in you wish to add.
If you can't find your style in the "get more styles" option, you can customise an existing style.
Please note: this is a last resort - there are thousands of styles out there, rather first check for your one.
A useful guide on the different ways to customise can be found on the Citation styles website. Please note that this is a very technical guide, so we have rather provided an in-depth video for you to watch first.
Again, editing a style is not a quick process, or a quick fix. It is a last resort.