Run the statements in the right panel.
You can get the last generated Identity value by using the IDENTITY_VAL_LOCAL function. This returns the generated IDENTITY value for the last INSERT statement.
What you should see is two result sets in the bottom right panel. One of them displays the contents of the accounts_third table. The last value in the table is of interest and has a value of 'Lastone' in name column and a generated value in the acctno column. The other result set only has one value that is the same as the acctno in the accounts_third table.