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In the trigger card, select Edit:
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Select the + icon to expand the page so that you can add custom input fields:
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Enter the Input title and Input description for each custom field that you want to make available when someone runs your flow.
In this example, you'll create two custom input fields (Bug repro steps and Bug severity) so that anyone who uses this flow can enter the steps to reproduce the bug and rate the bug's severity:
Source: Microsoft