If you have buy position , sell that position and buy next month futures, and vice versa in short position( rollover is nothing but squaring off current month and taking or buying or shorting the same position in next month) hope this clarifies
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As Nishant explained, its just squaring off your existing position for current month and getting into the same position on next month contract.
For Example:
If you have bought Nifty futures November series and you feel market will continue to raise even after this month expiry, then on expiry day you call sell your november contract and go long again with december series,
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