In order to upload data, first select the project that you want to add the data into. From there, you will be presented with a list of datasets that are already loaded into the project.
From there you can upload the dataset by clicking the Upload button on the left. You will be presented with a dialog that you can use to browse to the data.
As data uploads it will show progress as the data is uploaded and when it is finished you can close the dialog.
After uploading the data, it is sent to background job where it will be processed. Each file is inspected for any supported datasets. These are inserted into the project and when the process is finished you will receive an email showing the summary of the datasets that were found and processed.