Scratch

When you finish your projet on your Scratch program, there's a button at the top of the program, next to File, Edit, etc, and it's called Share. Click on Share button, and a window pops up, where you type in your project name, project notes, tag things, etc. There's also a compressed selection if you want to at the bottom of the window, and then, click share/upload. It'll upload onto your page on Scratch.

However, you have to make sure you have typed the right username and password in for verification.    Hope this helps!