How to change email address of Contact or other data?

Produs IO is really useful if all the data are up-to-date. Therefore it is important that every Account has his own assigned user to take care. Read how to assign user for a certain record in the answerI want my co-worker to be assigned for an Account...

Assigned user and all the data can be changed, added or edited easily. Read more in the manual, chapter Urejanje.