Ensure that your account information is registered in the "Browser Automation" tab of My App.

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In the secret browser that pops up after specifying the link in the browser automation action, hover over the element where you want to input the password and click it.

From the displayed options, select "Enter Password".

Enter the action name.
​​If you don’t edit it, the default action name will be "Enter Password".
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Select the account you want to use, select the corresponding account, and then click Add.