Access Denined after creating content.

Hello,

I want to create newpaper website. Where reporters will create stories but those stories will be get publish after editor approves it. I set this workflow with "workflow" module. Now publish content will go to approval queue. but after submitting the content I wish to show user a massage that your content is successfully created and send to editor for approval. but instead of that it shows access denied page.

Please tell me how to remove this access denied page and how to show a custom massage there.

Thanks.