If you want to upload a new package, go to the Upload packages page by clicking the entry in the left menu.
Add packages by clicking the blue + button in the bottom right corner of the page or drag-and-drop files into the center of the screen.
Select the repositories into which you want to upload packages by clicking the select field on the top of page and choosing them from the list. If you make a mistake, you can simply remove a repository by pressing the backspace key. You can optionally fill in the Changes text field for each package.
If packages are uploaded successfully, the progress bars turn green and you see the Success message.