In this case Select Accounts/View Accounts this is going to display a window showing all the accounts, select the account that you need. This is going to provide you to pick the option Edit. Then select this option, modify the information and then select OK.
If you still getting problems try to reinstall the program from the next link, remember create before the installation a backup data folder, so you would not lose any information: https://www.nchsoftware.com/personalfinance/index.html