Accessing the two column grid is problematic because you have basically nested divs inside a div. The way to handle this is to not even try to select the extra divs from the left panel at all. Go to the bric selector on the right and choose your paragraph bric from there (I used the title and paragraph bric). Then hover your mouse over one of the columns - it will turn blue on hover - then click to place the text bric. Repeat for the other column.
You should now edit your text and ensure that it’s all left aligned. What you get is something like this:
Now, if you want to incorporate your image, make it PART of the transparent PNG. In other words, don’t simply add it as an image to the carousel. Remember, the height of the carousel will be dictated by the height of the image you place within it. In my example, I created a transparent PNG 1200 x 500 px then added the logo/design and scaled it within the boundary of the slide image. It looked like this (I’ve created as black on transparent so you can see it in this post - you would probably use a white on transparent logo in your design.)
Now, the logo/design is placed within the image to create the space you need for the captions. Export this image from your image editing application as a transparent PNG and add it as a slide to the carousel. It will look something like this:
If the text looks a little bit close to the logo/design, the easiest way to correct it is to go back to your image editor and increase the size of your slide image (maybe 1200 x 600 px). However, DON’t make any changes to your image until you have previewed the slider - there is a marked difference between what you see in the blocs editing environment and what you see in preview. The image below is is how my example looks in preview:
As you can see, the spacing between the logo/design and the text is much larger.
It may be a bit of trial and error regarding the final image dimensions, but once you’ve got it set for your most text intensive slide, use the same dimensions for all the slides in your carousel.