Adding custom editable field in ticket creation ( customer front-end / agent front-end )

Hi, I'm studying otrs from several months before making it operative but I didnt found an explanation or example on how to put an additional field in ticket creation.I need to add a simple field like contact phone number . I try with the FreeText Option but I noticed that I cant edit it on the agent front end so if a customer made an error I cant correct it, i should send another mail to have it corrected while it could be more useful to edit this simple field. I verify that there are some free text field on the agent front end which are editable but I didnt found how to enable the same field in the ticket creation on the customer front end. Is there someone that had this need/issue ? Thanks in advance to all the list for every suggestion, Bye Cristian Marchionni ------------------------------------------------------------------ Cristian Marchionni Supporto Tecnico Sistema Nord Srl e-Mail: cristian.marchionni@sistemagroup.it ------------------------------------------------------------------ Le informazioni trasmesse sono destinate eclusivamente alla persona o alla società in indirizzo e sono da intendersi confidenziali e riservate. Ogni trasmissione, inoltro, diffusione o altro uso di queste informazioni a persone o società differenti dal destinatario è proibita. Se ricevete questa comunicazione per errore, siete pregati di contattare il mittente e cancellare le informazioni da ogni computer. The information transmitted is exclusively destined for the person or company indicated in the address and is to be intended confidential and reserved. Any further transmission, forwarding, diffusion to and any other use of these information related to persons or companies different form the ones who is intended for is prohibited. If you receive this communication erroneously, please contact the sender and delete the information received.
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Cristian Marchionni