1) Go to the Server Installed path i.e. usr\sap\\\J2EE\configtool\
2) Choose configtool.bat and start it.
3) Under Global Server Configuration, choose Services.
4) Find com.sap.security.core.ume.service, click it.
5) Under Global Properties, find ume.superadmin.activated
6) Set the Custom value to TRUE. Click on SET to apply the new value
7) Apart from that, you have to set another property i.e.
8) ume.superadmin.password, define some password.The password that you are defining is for SAP*. save the changes.
9) Restart the cluster / server. Issue the command stopsap to do so.
10) Log on to Portal with SAP* as user and the defined password.
11) Create a User with Super Administrator role.
12) Go back to Config Tool and set the Custom Value as default value i.e. FALSE. save the changes.
13) Restart the Server.

f you are able to logon to Visual Admin , You can create a new user and assign him administrator group or Reset password .
1) Go to the Server Installed path i.e. \usr\sap\\\j2ee\admin\go.bat Or in UNIX /usr/sap///j2ee/admin/go .
2) Choose go.bat / go and start it.
3) Under Cluster ->Server, choose Security Provider .
4) Select Tab 'Runtime' and Inner Tab 'User Management' , Click Create User .
5) And then assign to group Administrators .
6) No Need to restart J2EE engine , Open http://:/irj/portal .
7) Now you can User Administration Identity Management , Search for Administrator user and Unlock it . etc ....