Custom text box widgets can be added to either a blank report section or a pre-built section. 

Navigate to the report section where you'd like to add the custom text box. If the widget Sidebar is not visible on the right side, expand it by clicking the gray line on the far right of your report editor.

In the Widget sidebar, click the Objects tab. , Next, click Textbox option, then drag and drop the widget onto the report.

Use the edit widget feature represented by the “...” ellipsis in the right-hand corner of the Textbox and click “Edit” to enter text.

You can edit and resize the Textbox widget as you would any other widget.