hello,
first of all u have not mentioned about your age.
There are many ways to reduce weight.
Two most common ways are...

1) Stop gaining more
2) Start reducing more

For 1)
U have to take diet restrictions.
for that, Stop/ reduce eating foods with oils, butter, whole fat milk, Dairy products except paneer, junk foods etc.
start eating juicy fruits, High fibre diet with green leafy vegetables.
Add volume of salads in each meal.
its good to have more numbers of meals than a single large meal.

for 2)
Do exercise compatible with your age.
start with 45 min walking or 30 min jogging.
if u r interested in sports/ swimming , it will be most helpful.