Setting up account codes

I am trying to set up account codes in my chart of accounts. I have selected 'Set Period ’ on the summary page, but it does not give me the availability to check mark Account Codes. Nor does it give me options to select Cash or Accrual.
Do I need to select something else?
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To set up Account Codes go to Settings > Chart of Accounts and edit the individual account.

You will only see this check mark if Account Codes have been setup under Settings > Chart of Accounts.

Read this topic where this is under discussion Cash Basis Accounting - #2 by Tut

I have been to Settings > Chart of Accounts, I have edited each account and allocated a number, but when I go to edit it again, the code number has disappeared.

Did you click “Update” after editing ?

Yes, but when I go back in, the number is gone.

So you have an Account without a code
0000000%20Bug%201

You enter an Account Code
0000000%20Bug%201a

After clicking “Update” you should see the code next to the Account name
0000000%20Bug%202

Then clicking on Set Period you should see
0000000%20Bug%202a

If not, what Edition / version are you on