Thanks for writing in!
Please create a new page and select the "Blank - Container | No Header, No Footer" or "Blank - No Container | No Header, No Footer" page template. You can then edit the page in Cornerstone adding a section, row, column, image element for your logo and finally a text element below the image.
To know more about the page templates in WordPress, please check this out:
To know the different page templates in X theme, you can check this:
And if you just started to use X theme, you will need to be familiar with our Cornerstone page builder:
Hope this helps.