How to change Service Account for User Profile Sync which was set up wrongly during Installation?
This is how…
Step1: Go to Central Administration and Click on Manage Service Accounts under Security
Step2: Select the Service from the first selection. If you are changing user account for User Profile Synchronisation, then select accordingly.
Step3: You will be provided with the information on its account name used. Click on the link “Register New Managed Account”
Step4: Give your required username and password and click OK. Account will be changed for your Service.