Rosy, I looked up your account by your email address and you haven't requested any proofreading. There's none pending. The "Request Proofing" link out to the right of each of your articles under the Article/PR Admin, Edit/View option is for you to click IF you want proofreading. It's an option available, but not required. Even if you accidentally click it and it says Pending, it won't actually be processed unless you have paid for the proofreading service.

can i use articles here i had submitted at other place but since then have removed then from there or do you only except articles never published or submitted before.

We're fine with articles that have been published elsewhere. You aren't limited to original content.