Integrate Word in Project

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C#

WPF

Hi there!
I´ve started a project and everything is working good so far. Now i want the program to open Word. That works fine too. But now i wanna put the Wordwindow inside a panel of the Winform. How can i do that? I tried it isMdiContainer but that does not work because the

Word.Application()

is no Window and the panel has no propety "isMdiContainer". Please help!!

Secondly i watched a video on utube how i can replace something in Word or have Merge Field and put something in it. I tried but it doesnt work:

foreach(Microsoft.Office.Interop.Word.Fields Field in document.Fields)
{
    if (Field.Code.Text.Contains("test"))
    {
        Field.Select();
        application.Selection.TypeText("Name")
    }
}

Word opens but the fields are not changed
I would be glad about help

Thank you