@chidiejike Refer to the Repeater Documentation to see how to use Repeaters.
The Repeater is populated by using the data property, but you cannot modify the data array in-place using an index - $w(“#repeaterfill”).data[i] will not work.
The Repeater does not have a container property. Use the index parameter of the onItemReady() event handler to access each Repeater Item by it’s index (position) in the Repeater.