If you only want text with no user interaction other than advancing the slider, you can simply add a title & paragraph bric to the empty container you see in the carousel slides. You can then edit or style the text as required. If you want the text centred vertically in the slide, select the paragraph element and create a custom class. In the metrics tab of the class editor, adjust the bottom margin to move the whole bric up so that it is more vertically centred within the slide.
You will also have to add an image to the slide. This should be a simple transparent png so that the background colour of your page or bloc shows through the slider. The size of the image doesn’t really matter, but the aspect ratio is important as it will dictate the aspect ratio of your slide. For example, if you want your slide to have an aspect ratio of 16:9 you could create a simple transparent png in a graphics app sized at 16px wide x 9 px high. When added to your slides it will scale up to fill the width of the column in which the carousel has been placed. Just be sure to use the same background image on every slide to keep the carousel slide sizes consistent.
Here is an example of how it should look with a plain white background and black text.
And here is how you adjust the position of the paragraph text with a custom class. Just apply the class to the paragraph element and the heading element will go along for the ride.
Note: Depending on how much text you place into each slide you may have to create a custom class for every slide. If the amount of text is the same in each slide, you can use the same custom class on every slide. If you want the heading to be the same for every slide, just use a paragraph bric in the slide itself and add the common heading above the carousel. This will then look like the example you posted - the heading will remain static whilst the paragraph text will change upon each advance of the slides.