1.Open Windows Services console. Locate the required OpManager service (For e.g, ManageEngine OpManager Central). Right click on it and select Properties.
2. In the Properties window, Go to Log On tab and select This account. Click on Browse.
3. Choose the account which has Read/Write access to the MSSQL DB of OpManager. Enter the password (Preferably choose the account mentioned during DBConfiguration).
4. Click on Apply and then OK. After making the changes, restart the required service (ManageEngine OpManager Central).