Please make sure you are "logged in" (top right corner);
Click on my contribution (in the main menu) (only available after registration and linked to announced presentation);
Click on View;
Click on "Add Material" (under Files, Edit files);
Under "Upload File" and in "type": select "slides", browse to search for your file and finish with "upload";
Please note that you need an account (a CERN external lightweight account or a CERN NICE account) to upload your presentation.
If you are not already in possession of one; please register for an external lightweight account through this link;
Once this is done return to your e-mail in order to confirm this request !!!
If you already have an account, but there seems to be a problem: please refer to the same link and/or contact the CERN helpdesk (+41 22 767 8888).