Text Blocks are used to create inline interactions. A text block is basically a paragraph, and forms a framework into which one of the two available text-based inline interactions (Inline Choice, Text Entry) is then inserted.
1. Using Text Blocks in Inline Interactions
After you have created a new Item, drag the Block interaction (represented by a letter A icon) from the Inline Interactions library below Common Interactions on the left, onto the blank Item and drop it onto the canvas.
This creates a field (containing a sample text) in which a text may be entered from a favorite source (you can copy and paste text from any text editor, or website, for instance), or typed in.
To enter your text, click inside the text field.