How to implement an SQLite Update command properly

I am looking to use an update command to change all my users details, depending on the users email address. I have been told to use an update command, but I don't properly understand how to use one, and the online documentation is pretty poor. Can anyone help me out? Here is my code:

public class DatabaseOperations extends SQLiteOpenHelper {

public static int database_version = 1;
public String CREATE_QUERY = "CREATE TABLE "+TableData.TableInfo.TABLE_NAME + "("+TableData.TableInfo.USER_NAME+" TEXT,"+TableData.TableInfo.USER_PASS+" TEXT,"+TableData.TableInfo.USER_EMAIL+" TEXT,"+ TableData.TableInfo.USER_WEIGHT+" INTEGER,"+ TableData.TableInfo.USER_GOAL+" INTEGER );";


public DatabaseOperations(Context context) {
    super(context, TableData.TableInfo.DATABASE_NAME, null, database_version);
    Log.d("Database Operations", "Database Created");
}

@Override
public void onCreate(SQLiteDatabase sdb) {
    sdb.execSQL(CREATE_QUERY);
    Log.d("Database Operations", "Table Created");
}

@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {

}

public void putInformation(DatabaseOperations dop, String name, String pass, String email, int weight, int goal) {
    SQLiteDatabase SQ = dop.getWritableDatabase();
    ContentValues cv = new ContentValues();
    cv.put(TableData.TableInfo.USER_NAME, name);
    cv.put(TableData.TableInfo.USER_PASS, pass);
    cv.put(TableData.TableInfo.USER_EMAIL, email);
    cv.put(TableData.TableInfo.USER_WEIGHT,weight);
    cv.put(TableData.TableInfo.USER_GOAL,goal);
    long k = SQ.insert(TableData.TableInfo.TABLE_NAME, null, cv);
    Log.d("Database Operations", "One Row Inserted");
    SQ.close();
}

public Cursor getInformation(DatabaseOperations dop){
    SQLiteDatabase SQ = dop.getReadableDatabase();
    String[] columns = {TableData.TableInfo.USER_NAME, TableData.TableInfo.USER_PASS, TableData.TableInfo.USER_EMAIL, TableData.TableInfo.USER_WEIGHT, TableData.TableInfo.USER_GOAL};
    Cursor CR = SQ.query(TableData.TableInfo.TABLE_NAME, columns, null, null, null, null, null);
    return CR;
}

}