Updating repeater rows
In this tutorial, you'll learn how to dynamically update data in a repeater's dataset using the Edit row data action.
1. Widget setup

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Open a new RP file and open Page 1 on the canvas.
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Drag a rectangle widget onto the canvas, right-click it, and select Create repeater from the context menu.
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Edit the Column1 cells to be numbered from 1-3.
 
2. Update the row's column1 value when the rectangle is clicked
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Select the rectangle widget and click New interaction in the Interactions pane.
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Select the Click or tap event in the list that appears, and then select the Edit row data action.
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Select the repeater widget in the Target dropdown.
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Leave the This radio button selected.
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Click +Select column and select Column1 in the list.
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Leave Value selected in the dropdown that appears, and enter
Clicked!in the text field next to it. - 
Click OK to save the action.
 

3. Preview the interaction
Preview the page in your web browser and click a rectangle in the repeater. Its text should update to "Clicked!".