The best thing to do would be to get a laptop cooler that matches the size of your computer. Get one online, NOT from in a store. You don't want one with a small fan, it will do absolutely no good unless it is right under the intake fan.
Again, be sure you get one that fits the computer and try to stay away from small fans. You can expect to pay at least 30 USD for a decent cooler.
Another thing, HP laptops are notorious for running hot. Don't use the laptop anywhere that will cover the bottom (pillows, blankets, beds, etc..) as it basically suffocates the computer and makes it get hotter. If you must use it in one of those places, put something a flat surface under it (like a similar sized text book) to make sure that the vent can get air. Also, if you use it on a desk, if you take anything and put it under the back feet (on the same side as the screen) you will find that it makes a good difference in temperature, even it's just a 1/4" - 1/2" lift, the fan will be getting easier access to air and the temps will lower by a few degrees Celcius
definitely try the cooling pads but if you wanna go cheap cheap then I've seen people use muffin trays and metal cookie trays to absorb the heat as well.
The way I fixed mine (takes computer knowledge) is to take it apart and reapply thermal paste to the cpu. The manufacturer usually does a bad job at this and I used artic silver 5 to replace mine. You can probably youtube how to do it.
Something you can also try, if you haven't already, is make sure the fan is free of dust and lint. If you can easily pull your laptop frame apart to clean the fan, do that, but if you can't, some canned air will help spray the fan out. Even if the computer is new, this will help, as the fans often are full of factory dust. I sprayed my laptop fan out a few months after I got it, as I had been having overheating problems, and that alone dropped the core temperatures by about 10 degrees.
The link here goes to Real Temp, which is a program you can use to monitor the computer's internal temperature. It will tell you when it's about to overheat. It's also a very helpful way to evaluate cooling methods if you run it before and then after cleaning the fan, or propping up the back of the laptopl
All of Zach's advice is right on the money, I just want to say "what he said."
This is a really good cooler with 3 fans that should do the trick. Really, what Zach said about putting the laptop on the right surface is super important (keep it off your thighs, pillows, etc.)