You can either upload a video on YouTube and then submit the link to us (most common way), or directly upload it on KidzTube once you have an account. Since KidzTube goes out to a fairly large viewing audience, it must also meet certain editorial quality guidelines. In any case, we carefully review all submissions and look forward to seeing your content.
If you upload a video, it should be in mp4 encoded format and not flash/quicktime, since many browsers don't support it. Please do not post anything personal that could identify you, like showing your face. You must also have full rights to the content. However, you can sometimes use short clips from other sources, but it needs to meet fair use guidelines.
Please explain your PDFS question better. Do you want to post something that is a PDF file?