When you receive a margin call warning, you can deposit enough funds into your account to increase its balance, or you can close current trades by returning the Equity to Reserved ratio to a level higher than the current one.
By immediately covering a margin call, you reduce the possibility of liquidation of your current trades and gain better control of your funds.
If margin-call is not covered and the ratio drops to/below 50% the mechanism of gradual closure (liquidation) of Leverage operations is triggered.