According to AMRJ's copyright policy, the copyright belongs to the Journal upon submission of the manuscript. Moreover, it is considered unethical to submit the same manuscript to more than one journal at the same time.
If the authors want to withdraw the manuscript during its processing, an email has to be sent notifying their intention. A final letter from the editorial office for withdrawal of the manuscript will be sent to confirm the withdrawal.
Please note that without a formal email of withdrawal, a manuscript is not considered withdrawn and use of such a manuscript elsewhere will be construed as ethical misconduct.