logged in user read and write page

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Have a look at using Wix Dataset API and the getCurrentItem function, although if the user is logged in then you can easily get their userid or email for example and simply use Wix Data query function of eq to match from your dataset and get only their info.
https://www.wix.com/corvid/reference/wix-dataset.Dataset.html#getCurrentItem

$w("#input1").value = $w('#dynamicDataset').getCurrentItem();
// Gets all the fields data for that user.
 
$w("#input1").value = $w("#dataset1").getCurrentItem().fieldName;
// Gets only the specified field for that user.