validate button

When i click on Valider button as shown in image (name=a) below then image should go on uper place where other images and paragraphe should show in down when i click on image. AND in image b there is 2 options 1 is for add a presentation and other is last added presentation. so in add a presentation there is a page shown in image c where an option name soumettre aux experts which button is not properly working when we click on this button then this presentation should go on last added presentation.