After installing this asset from forge, you need to create an account in Azure portal. Kindly use below link to create an account.
Home - Microsoft Azure
After creating an account, Click on create a resource + icon
Then search for translator in search bar
Then click on Create option in Translator
Then
After creating the resource click on "Keys and Endpoint"
Then copy Key 1 value and region value and use it in our method's input for AzureSubscriptionKey and AzureSubscriptionRegion to use our methods in service application.
Demo application also require Azure keys to check how these methods are used in screens.
Kindly ping me if you need any further clarifications.