At this moment, the feature to manually add or enter transaction data is not available (be it through importing a file or inputting transaction details). Our development team is aware of the feedback that it is useful to be able to do so and this is taken into consideration as we continue to make improvements to the application.
So what can I do?
Currently, we do have the option to add 'Offline Sources' which can work as a substitute. Alternatively, you might find the following articles helpful:
2. How to Split Transactions (after you have added an offline source)