how can i carica a video on youtube?

It's quiet simple:

1)press the "Upload" button on the superiore, in alto of YT's home, successivo to the browse button
2)then when the carica page appear, wait until the "Upload Video" button to reveal and te click it
3)after that, choose a video file te wanna carica from your computer then wait till the uploading is finish
4)while waiting, te can modifica the video detail (right below the uploading progress) da change your video's name, description, tags, your video's privacy and the category
5)when it finish, click save to save your detail within the video file you've upload
6)if te want to change its thumbnail o etc just go to "My Video" on your account's option and click on modifica and thus...

hope this help you, I'd like to help anyway ^^