How do you add people into a collaboration?

Click the my studio link at the top right corner of the page and click the edit/revise link under the image you want. From there click near the top where it says "entry users page." Also, when you are submitting something and giving it a title and such, you can click the advanced options button at the bottom of the page and find an option for adding collaberators there.

I tried that. It didn't work.

That's how it's done. Did you add the right users? Why exactly didn't it work? Did you ask the collaborator if they can draw on your picture?

Note that you can't add yourself as a collaborator to drawings owned by other people; they have to add you themselves.

I was trying to add someone else to collaborate on one of my drawings. It just won't let me select a user.

When you're on the user selection page, press the select button instead of typing anything into that field. It'll open a window that searches for usernames. Just enter the person's name (or use one of the other options if you want), click next, it'll give one or more matching users (or none if there aren't any), and you just click one and click okay to close that window. Then just click add. That way it's pretty much certain to do the right thing.

I did and it didn't close. I started out trying it that why. I found that it works on my other computer...