You need to start creating the interface top down.

You obviously want the top level to be layouted horizontally, having a left side and a right side divded by a line.
Btw, you might want to consider using a splitter instead of the line.

On the left side widget you add the text edit, the two buttons and the label.
Then you CTRL+Left Click the buttons and the label and click the "horizontal layout" button.
Then select the left side widget and click the vertical layout button.

Repeat similar steps for the left side widget.

Cheers,
_