I think I've made an error entering my email settings as I can receive emails but can't send them.

I wanted to check &, if necessary, ammend the settings but find that the only option when I click "Accounts" is tp add an email address and no option to ammend the existing one. I've tried adding the info again with the ammendment I want to try but it is still trying to send using the original settings.

Would be very grateful if someone can tell me how to access the account settings