You should follow this steps:
1. Create an event into the minus icon --> On click - Set Value / Click into Calculated and set the following expressión : (Input text field value - 1 ) In case you want that the minimum value is 0 you will need to set a condition that the input value to be > 0.
2.Create an event into de plus icon --> On click - Set Value / Click into Calculated and set the following expression: Input text field + 1.
Kindly let me know how it goes.
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