Just gonna quote my post in another thread since it applies here as well (and on the front page lol)
You can't remove weight from only your [insert body region here].
I've made this analogy before, but I'll do it again.
Think of body fat like water, it flows to the shape of its container.
Fill this glass with water
It's going to have more water at the bottom than it will at the top
Now fill this one with water
It's going to hold more water at the top than it will the bottom.
Your genetics are going to determine the shape of your glass. You can't remove water just from the bottom of the first glass for example, the rest of the water will flow in to replace it.
Basically, the only way to remove fat from your legs is to reduce your overall body fat, which will reduce fat from your entire body, not just your legs.
tldr; there is no specific fat reduction outside of surgery (which is only temporary you'll come back to where you started if your habits are the same)
You're just going to have to eat cleaner and exercise more or the same as you do now but with higher intensity during the time you spend.
As far as losing weight in general, as I said, increase the intensity. If you're walking 30 mins, try to turn that into 25 mins walking, 5 minutes jogging. Then when you feel comfortable with that, increase it to 5 mins of jogging, walk for 20 mins, 5 mins of jogging.
Then gradually work 5 min intervals into your walking until your walking days turn into jogging days.
Then weight training will also help with weight loss, etc.
If you're not seeing any changes with the current amount of activity, you'll have to change your eating habits, increase the intensity of your workout, but ideally, both.