This is a good app to help you budget your expenses. A basic understand of credits and debits is needed to be able to use this app in my opinion. You dont need to be an accountant but it would help you to know that: Assets accounts have a debt normal balance, which means you debit it to add to it or in the case of this app(use the plus black icon). Also expenses have a normal debit balance. Liabilities and revenue have a credit normal balance, which means you add to that account by crediting it or in the case of this app( use the red minus icon). To take away from any account just apply its opposite normal balance. For example to reduce an asset account which have a normal debit balance you must credit it. I hope this info helps you in using this app. It is well worth the $3.99 I paid for it;).
P.S speaking from an accounting stand point. (Revenues are suppose to have a credit balance), but in this app it seems to have it setup as a debit account in order to add to it.
Sincerely,
Accountant in the making.
Chess Master83 about Ledger, v2.1