How to prefill fields for the recipient

How to prefill fields for the recipient

Here's part of the Deluge code:

'Startdatum' and 'Einddatum' are fields defined as 'Recipient: Prefill by you', while 'Naam' is defined as 'Recipient: Guide'.
Above code correctly fills in 'Startdatum' and 'Einddatum' in the form, but fails to pre-fill 'Naam'.

The guide should fill in his/her name and address in the form. But in CRM we already have the name and address.

So we want to make it easy for the recipient and pre-fill fields for him/her, but the recipient should be able to modify these fields.
How can we do that? Because fields defined as 'Recipient: Pre-fill by you' can indeed be prefilled by us, but they cannot be changed by the recipient. 

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