Unable to get Integration tab in menu of my seller central account of Amazon

I have searched a lot for its solution on internet. I have seller central account of Amazon but to get MWS Access Key and MWS Secret Key, I need to go for Integration tab in seller central account which is not present in my account. I have asked to support but did not get any reply yet from last two days.

Can anyone help me out to get these details in seller central account?