Currently, there is no global edit feature in Mendeley which allows you to edit multiple fields from different citations at once. Each citation must be edited one at a time.
In Mendeley Desktop: Tools>>Check for Duplicates
Do this often to make sure you don't have duplicate citations.
From Mendeley desktop under Feed claim your publications. Scopus will give you recommendations!
A Watch Folder allows you to automatically add new documents to your Mendeley library. Simply drop PDFs into the folder and Mendeley will import them automatically for you.
To set up a Watch Folder:
Let Mendeley rename your files automatically when imported.