Read the rules before proceeding!

upload limit (locked)

Users of the Viewer level or below cannot upload at all, for the safety of the site.

You can see the information about, or apply to be an editor here.

Editor Limitations

You can only have so many unapproved posts at a time, by default: 5.

This limit can be raised by having posts approved (new upload slot per 5 approved), or by contacting site administration if you believe you should have an exception made.
This limit can be lowered by having posts deleted (-1 per 2 deleted, if you end up with a negative or 0 limit via too many deleted posts, contact site administration.

This limit does not apply to users of Privileged or above, as their posts are automatically approved.

You can see your upload limit here.