The methodology depends on your nominal configuration.
If using the standard Nominal set up
Click Financials then click Accounts.
Locate the Nominal account in the list, highlight it, and click Edit.
Change the Account Name in the Details tab.
Click Save.
If using Advanced Nominal Ledger
Click Financials then click Chart of Accounts.
Locate the required nominal by expanding various categories on the list until the final level is reached.
Click View in the Ribbon, and then click View Record from the subsequent window.
Amend the Account Name and click Save.
To ensure future accounts built for that code take the same name, also make sure that the Category is updated from within the Financials area.