To upload transactions individually go to the Accounts Summary page and click the Load Data button. Then use the "Single Transaction" tab to start.
The option to upload a single transaction is useful for the purposes of adding in small amounts of trades or transfers. Under the Single Transaction tab, fill out all of the mandatory fields and save. Any option fields, which are labeled accordingly, are highly recommended but not required to save.
Note you should add your trades and transfers separately under the corresponding section.