Please make sure you are "Logged in" (top right corner);
Click on the menu on Contribution List and then click on your presentation title
Click on the "pencil" next to Presentation Materials.
In Manage Material, select Upload files
Click on "browse" to look for and upload your presentation and then click on Upload at the bottom of the window.
Please note that you cannot upload a presentation without being logged in. You can use via edugain also you home institution login. If you any of the listed login accounts, then please register for an external lightweight account through this link;
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 + 41-22-767-7777 (email@example.com). In case of technical problems with the presentation of your contribution please contact Wolfgang Mexner +49-721-608-26189 (Wolfgang.firstname.lastname@example.org).