If you are submitting singular or small items (for example, an article, a photo, a spreadsheet, etc.), you can submit them via the easy-to-use web interface. Simply log in with your NetID and NetPassword, click Submit, and begin a new submission. See a step-by-step guide to submitting via the web interface.
If you have many items to submit, or if your files are more than 2gb each, contact the repository admin about bulk importing.