If you don't have Forge account follow this link to create new account and create application on Autodesk Platform Service (Forge Viewer)

2 important things that you have to noted when creat new Forge Account : 

• The Callback URL, you have to add new callback with the URL is https://app.oceanbimcloud.com/api/forge/oauth/callback

• Client credentials which is contain Client ID and Client Secret we will use to connect on the step bellow

After create new App on Forge Viewer you will have the Client ID and Client Secret from Application. Copy these Id to the config feild to finish the settup and Save your setting.