1) Find the Dataprovider.com hub item on the Transform Hub page (Home page of your maltego client)

2) Click on "Install" > Click on "Yes" to confirm installation: 

3) After Successful installation you should see a summary of the installation:

4) Dataprovider allow free but limited usage of thier service. To unlock more requests, add the API key by clicking on "Details" > click "Settings" and input API Key in the input field.

4) You are now all set to use dataprovider.com on maltego!