Assuming you are now running the latest version of MIUI, you'll need to enable the installation of apps from unknown sources, then install the various Google services required to run Google apps on your phone.
Open the Settings app
Tap on 'Additional settings'
Tap on 'Privacy'
Toggle on the button for 'Unknown sources'
Open the Mi App Store
Search for 'Google'
Tap Install next to the top result - a 0.2MB file
Once installed press Open
Tap the large blue circular button on the next screen
The installer will run through the installation of the various services required: the Google Services Framework, Google Account Manager, Google Play Services, Google Calendar Sync, Google Contacts Sync, and finally the Google Play Store. Tap Install for each when prompted
Once the Play Store has been installed tap Open
Enter your Gmail address and password, and agree to the permissions
Google Play is now installed on your device, and you can install apps from here as you would on any other phone, including Gmail, YouTube and Google Drive
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