1. Open your Google Docs document.
2. Click on the "Insert" menu at the top of the screen.
3. Select "Drawing" from the dropdown menu, then choose "New."
4. In the Drawing dialog box that appears, click on the "Text box" icon in the toolbar. It looks like a "T" with a square around it.
5. Click and drag to draw the text box on the canvas.
6. Once the text box is drawn, you can click inside it to type your text. You can also resize or move the text box as needed by clicking and dragging the corners or edges.
7. Customize the text box further by changing the font, size, color, alignment, and other formatting options using the toolbar at the top of the Drawing dialog box.
8. When you're satisfied with the text box, click the "Save and Close" button in the top-right corner of the Drawing dialog box to insert the text box into your Google Docs document.
9. The text box will appear in your document as an image. You can double-click on it to edit the text or make any other changes using the Drawing tool.
That's it! You've successfully inserted a text box into your Google Docs document using the Drawing tool.