How to populate a text field by a form array value

I am trying to test an edit of my data file already saved.
The method I am using id
1: Accept the key 'data field value for the record to be updated' using dynamic dropdown.
2. Pass the value to next page & copy the field values to form the database to form array.
3. Display the form field value in a text box & allow to change
4 Save the changed values to the data file.

I could able to do the first two steps, but can not populate the retried field values to the form for correcting.
I tried to add =[mydata][fname] in the 'Field Value' for the field (mydata is the model & fname is the field).
Can some one help, how can I populate the initial value for the field?

Screens are attached for clarity of understanding.

Hi Santosh,

The simplest answer is to turn off the Mode ID in the DB Read - you don't need it here.

Your code is fine - that works.

You could also change then name of the input element to [mydata]fname

Bob