You can add and move text on a connector the same way that you add and move text on other shapes.
For example, double click the begin point area of the Connection line, the text block near the begin point will be edited.
The text in the connector has a control handle ()
that you can drag to quickly move shape text.
To rotate your text, click the Text Block tool (Ctrl+2) on the Home menu, and then drag the rotation handle.
Tips: If you don't see the Text Block tool, click the down arrow next to the Text tool, and then click the Text Block tool.
Make connectors curved, angled, or straight
Add, Move, or Delete Connection Points
Add arrows, or other line ends to a connector
Add, move, or rotate text on a connector