The Account ID and Password provided to you by IOP Computer Center Team is a collective account for Systems access,Webmail and other IOP housed Web based Login portals.
The password change mechanism can only be initiated at the File Server level.
In order to do the same, you may need to perform the following steps:
yppasswd
ssh <your_account_name>@alpha.iopb.res.in
yppasswd
.