Before you start
You will require an Image Dedicated link to your data eg
https://di-map.img.arcgis.com/arcgis/rest/services/location-name/SceneServer
And a username and password.
Please ensure that your installed version of ArcGIS is up to date.
Create a new project
Open ArcGIS and create a new Global Scene.
Adding data
From the Map tab, select the Add Data dropdown and click From Path.
You will be prompted to enter a URL. Enter the URL that you were provided with upon delivery of the data, and click Add.
You will then be prompted to enter your login details. Enter these into the boxes provided and click OK
The data should now be displayed within the Scene window, as well as being listed under the 3D Layers in the Contents window.