Steps

go to studio.fitbit.com and create an account
Click new project
Then give the project a name (Glance in my case) and select Empty Project then click create
This will bring you to the fitbit studio.
Go to github.com/Rytiggy/Glance and click the green clone and download button.
Click Download ZIP
Open the ZIP and extract the Glance folder to your desktop. then open the Glance folder
Copy the contents of the Glance folder to fitbit studio
You now need to turn on the Developer Bridge in the Fitbit mobile app and the Developer Bridge menu on your Fitbit device.
Fitbit app: To enable the Developer Bridge. On the phone app, click the fitbit watch icon in the top right hand corner. Click Developer Menu then enable the Developer Bridge.
Fitbit device: To enable the Developer Bridge. On the watch, go to Settings and tap Developer Bridge, then wait until it says Connected to Server.
Connect the watch and the phone to fitbit studio. Then click run.
You should now see the watch face on yout watch.

Tested Web services

In the xDrip navigate to Settings -> Inter-App settings -> xDrip Web Service -> ON
You should now be able to open your phone browser and go to http://127.0.0.1:17580/sgv.json

How to set up coming soon. -Help requested
End point that looks like this:
- https://USERNAME.herokuapp.com/api/v1/entries.json

you should now be able to see the blood sugars on the watch.

This is a great resource for general fitbit studio/SDK answers. https://dev.fitbit.com/getting-started/
If your Fitbit device is unable to connect to the developer bridge, ensure that wifi is configured correctly, and that you are using the same Fitbit user account on your mobile device, and in Fitbit Studio.