Sure! The process is a little tricky, but here's what you're going to do.
First click this
[link]
Then choose which one you're uploading, finished art, scraps, deviantID etc
[link]
I chose finished deviation. Now pick which type of art you want to upload. For me it would be photography
[link]
Now type in whatever you want to say about this piece of art
[link]
Then choose the file and upload!
[link]
If you have any more questions feel free to ask!
~Wren