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To add a character to a TEdit while the user is typing, you can use the OnChange event of the TEdit component.

Here's an example of how to implement this:

1. Select the TEdit component on your form.
2. In the Object Inspector, go to the Events tab.
3. Locate the OnChange event and double-click it to create a new event handler.
4. In the event handler, you can access the Text property of the TEdit component and append the new character to it.

Here's a sample code:

procedure TForm1.Edit1Change(Sender: TObject);
begin
  Edit1.Text := Edit1.Text + 'x';
end;

This event handler will add the character 'x' to the end of the text in the TEdit component every time the user types a new character. You can replace 'x' with any character you want to add.