Auto-populate field on Zoho CRM

Actually I am facing a problem in Zoho CRM. I have a lookup on Lead form named as 'Introducer' (Contact) and have two more single-line text fields 'Introducer account' and 'Introducer Email'. I just need that whenever a user selects Introducer through lookup I want to auto-populate Contact's/Introducer's Account name and Email Id on 'Introducer account' and 'Introducer Email'. I tried to do using Workflows but didnt get lucky enough to find the solution. Please help me with this.