T Icon to Add Text Does not Appear on the Side of the Block

You can add up to 4 text boxes per block when creating a video. If the T icon to add text doesn't appear on the left side of the block, you’ve already added the maximum number of text boxes and can’t add anymore to that block. Click on the text box to edit the existing text or to delete that text box. 

LEARN MORE: How to add text to your project