How to get the Save buton of a dropped table from DB to work

Hey!

I'm pretty new to C# and just accomplished a DB with a Table. If i drop the Table ( details) onto a Form, it automatically gives me a toolbar and the Label / Textboxes of my table.

In the toolbar there is a Save button, but this isnt working ( for me?)

so im wondering how i can change the code to get it to work?

This is the automatically inserted code:

private void kundenBindingNavigatorSaveItem_Click(object sender, EventArgs e)
{
this.Validate();
this.kundenBindingSource.EndEdit();
this.tableAdapterManager.UpdateAll(this.kundenDataSet1);
}

I am also okay with a source to try to learn it myself.

Im using Visual Studio 2017 Enterprise Edition.