Word Application... inserting text

[Inga]

Hi,
I need a help, I need to insert text after definite word.... and I don't know what should I do...

this is my code :

object findLastName = "First Name:";
WordApp.Selection.Find.ClearFormatting();
WordApp.Selection.Find.Execute(ref findLastName, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing);
WordApp.Selection.InsertAfter("Inga");

object findLastName = "Last Name:";
WordApp.Selection.Find.ClearFormatting();
WordApp.Selection.Find.Execute(ref findLastName, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing);
WordApp.Selection.InsertAfter("Petrykina");

And the result should be :

First Name: Inga
Last Name: Petrykina

but not

First Name:
Last Name: IngaPetrykina