Can't upload level.

I keep trying to upload a level I made but it doesn't let me. Can anyone help?

Are you uploading to the forum or the KS levels archive? If you're uploading to the forum, then you need to host your file somewhere else. If you're using the KS levels archive, make sure it's a .knytt.bin file, not a .zip. And please explain what's happening in more detail; it'll make things a lot easier.

I'm uploading to the knytt levels archive and I'm trying my best to make the knytt.bin file. I'm just having trouble on that.

from the level editor, choose 'Compress' from the 'Level' menu.

But I did that. It doesn't work for me somehow.

Are you sure? Can you post a screenshot here of any error messages you get?

Well, I select the file it opens up to the inside of the file and that's where I get stuck.

Do you have a .knytt.bin file, or doesn't it even do that?

You should get a save as dialog after you press the compress button. When you selected a location, you type in a name for your level. You can do like this: go to My Documents, and enter mylevel.knytt.bin

Next on the archive when you press browse, you locate your file in the my documents (as you stored it there earlier) and press open. Then you press upload.

 I click on the file but then it opens up. What should I do there?

Try to wait.   

I'm afraid it will be really hard to help you, if you keep giving short answers that makes us guess what problem you are having.

Can you give an as detailed description as you can about what you do and what you see?

Wait... from the sounds of it, you're just opening the file in the level editor? Or the main game?
Follow these instructions:
1) Open the level editor.
2) Find your level, click on it, and click ok.
3) Now, go up to Level on the things at the top of the level editor.
4) Once you've clicked on it, click "compress"
5) Choose wherever you want the .bin to be, and then click "Save".
6) It should say "Compressing! Please wait!
7) Now, once it's finished (It will say Finished!), click ok, go to Knyttlevels.com, and click upload file. Locate where you saved it to, and click on the .bin. Should work from there.