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When using the encryption assembly, you may refer to the windows form example attached to the solution.

The way you use this article's implementation is quite simple. 

string password = "MyPassword1s123";

KraGiE.TripleDES des = new KraGiE.TripleDES();
des.SetKeys = "Whatever your Private-Key Is";
des.SetMode = KraGiE.TripleDES.CipherMode.CipherBlockChaining;
string encrypted = des.Encrypt(password);

System.Diagnostics.Debug.WriteLine(encrypted);

string decrypted = des.Decrypt(encrypted);

if (password == decrypted)
     System.Diagnostics.Debug.WriteLine("Success");
else
     System.Diagnostics.Debug.WriteLine("Kay doesn't know what he's talking about.");

des = null;

Just remember that you need to either use the SetKeys property or manually set the Key and IV properties with 24 byte and 8 byte arrays respectively.  Based on the parameter type of the Encrypt and Decrypt method, you'll receive the same type back.