To fill a text box in Canva, select the text box tool from the left-hand menu. Then click and drag your mouse to create a text box of the desired size.Once your text box is created, simply click it and type in your text. Then, click “Effects“. You can also use the formatting options in the top menu bar to style your text, such as making it bold or underlined.Then, select “Background”.You can modify the fill of your text box to your liking by adjusting the roundness, spread, transparency, and color.If you want to change the color of your text, you can do so by clicking on the “A” icon with a rainbow line underneath in the top menu bar and then selecting which color you desire.
You can add other effects to your text, such as shadows or outlines, under the “Effects” tab.
Once satisfied with your text box, click File > Save in the top menu to save your changes.