Since Mtrading has the Negative Balance Protection Program, you can request the Balance to be reset.
Note the following options:
1) you have the negative balance of -35$ or less.
In this case, the reset will be done automatically next day and you'll be able to deposit and trade again.
2) you have the negative balance of more than -35$.
In this case, you'll need to send us a request to support@mtrading.com from your registered email address and wait for the results of the review (usually within a day).
For example, you have the balance of '-73$'. Then your email will look like this:
Subject: Negative Balance Correction
Dear Support, please help to reset my negative balance.
Account number: 654321
Current balance is - 73$