You can easily upload a library entry by navigating to the top right corner and clicking on the blue create button and selecting ‘Library Entry’
You will enter the required fields (Title, Library and Entry Type). Adding a description is optional. You will then click on the blue next button. Depending on what entry type you selected, you will prompted to take action. After doing so, you will click on next to complete or you can click on the blue finish button if it appears as an option.