When a provider's documentation is not clear on how to find the DBProviderFactory instance, you can use Visual Studio's Object Browser to find it yourself.

Locate the assembly (1) and look for a class with the word "Factory" in it (2).

The factory class always has a property called Instance (3)

In the example below you would use SQLiteFactory.Instance as the parameter for the AdoConnector class constructor.

Figure 1

Figure 2

Figure 3