How do I create an object that I can use anytime during the life of my desktop app?

I don't know where to instantiate my singleton for the first time to then use it

I am thinking I instantiate the originalInboundData singleton class in the class where all init transfer and init conference are register with the app

My singleton C# class looks as follows:

public class OriginalInboundData
{
#region Field Declaration
private string dataPoint1 = "";
private string dataPoint2 = "";
private string dataPoint3 = "";
private string dataPoint4 = "";

private static OriginalInboundData instance = null;
private static readonly object padlock = new object();
#endregion

#region Properties Declaration
public string DataPoint1
{
    get { return dataPoint1; }
    set { dataPoint1 = value; }
}
 
public string DataPoint2
{
    get { return dataPoint2; }
    set { dataPoint2 = value; }
}
 
public string DataPoint3
{
    get { return dataPoint3; }
    set { dataPoint3 = value; }
}
 
public string DataPoint4
{
    get { return dataPoint4; }
    set { dataPoint4 = value; }
}
 
public static OriginalInboundData Instance
{
    get
    {
        lock (padlock)
        {
            if (instance == null)
            {
                instance = new OriginalInboundData();
            }
 
            return instance;
        }
    }
}
#endregion

#region Constructor
OriginalInboundData()
{
    //Do nothing
}

So I am not getting an error, I am trying to figured out where to call the singleton for the first time to them have access to it when I capture the data points during the init transfer or init conference