It is necessary to introduce 5 potential reviewers before "Finalizing the paper submission" via "Introduce reviewer" link.

These should not be from your own institution. These cannot be all from your own country (no more than one be from the same country).These must be expert in the field and not suggested for other reasons (such as collaborators of any sort). Please note that your reviewer suggestions will not always be used as a first choice.

Please see the following document accurately before submission of the paper:

Manuscript Submission Help