How to use margin or leverage in currencies derivatives futures?

i m not able to understand how to use leverage or margin.
today i have bought USDINR at 65.1650 and exit the position on 65.1750. i have made profit of 4 ticks on one lot.
but i have only receive RS-5 as profit. i don’t understand why would this happened.
so, please tell me what i have done wrong or any mistakes.
i am new at forex market so, if know anything about forex please put it here and help me.

thank you