How to change Hana database user password

Hello,experts:

my question is this:

1:I created one database schema named UserCenter in hana cloud platform,which on https://account.hanatrial.ondemand.com/cockpit/acc/pxxxxxtrial.databaseschemas

2,I connected this UserCenter db from my eclispe IDE by ADD Cloud System from Hana cloud

3.I   connect this db like

Class.forName("com.sap.db.jdbc.Driver");

    Connection con = null;

    try {

    con=DriverManager.getConnection( "jdbc:sap://localhost:30215/NEO_7VJLE4DXULH8VHKOHQC5E4LNU", "DEV_ET1A94G2PCPKYVBZPZXYLJDP8", "WHJabc123");

    }catch(Exception e){

     e.printStackTrace();

    }

I get error:SQLInvalidAuthorizationSpecException: [10]: invalid username or password:

4.I dont kown the db user DEV_ET1A94G2PCPKYVBZPZXYLJDP8 password,how i can get this init password from hana cloud platform ??

5.I try to change this user DEV_ET1A94G2PCPKYVBZPZXYLJDP8 password ,but i must put in the old password.

so,please help me,thank you very much