Step 1: Click 'Add content' on a row
To add content to the freshly created row, simply click 'Add content'.
Step 2: Choose a content block
Pick the type of content you want to add, at the 'Add a content block' window.
We will choose the 'Text (Markdown)' block for this guide.
Step 3: Enter content
The block will now appear and you can enter content. In this example we used the Text block, so the next step will be adding your text. Most content blocks have certain settings, that you can change to your preferences.