we have 2 options:

1. We can use E-Business suite screens

2. We can use FNDPASS utility
   

Please follow below steps for can change sysadmin user password:

1. If we want to change sysadmin user password with E-Business suite

Login to EBS  than:

System Administrator -> User -> Query the desired USERNAME and in password tab enter the new password.

To test, relogin into the applications as the SYSADMIN user and the new password.
Verify that a concurrent program such as Active Users runs.

2. If we want to change sysadmin user password with FNDPASS utility

Keep all services running.
Login  OS level by way of the applmgr user and source(run)n your environment scripts
cd $APPL_TOP
run APPSenvironment.env

cd $FND_TOP/bin
Run FNDCPASS to change the SYSADMIN password

FNDCPASS apps/apps 0 Y system/manager USER SYSADMIN <New Password>

Example:

FNDCPASS apps/apps 0 Y system/manager USER sysadmin/sysadmin123

Restart the Apache, Forms, Reports, 8.0.6 listener and concurrent manager services. << This step not mandatory, but recommended
To test, login to EBS as the SYSADMIN user with new password.
Verify that a concurrent program such as Active Users runs.

Reference:

How To Change The Password For The SYSADMIN User [ID 423274.1]

How to Change Applications R12 Passwords using Applications Schema Password Change Utility (FNDCPASS)? [ID 437260.1]

NEW FEATURE FOR CHANGING PASSWORD IN R12

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