On food packets, there are instructions. I recommend reading them. Dried pasta (which is what it must be if it's hard and crunchy) should be cooked in boiling water for around 12 minutes on the hob. If the water starts bubbling over turn it down a little. That's honestly all you need to do. Cooking is easy, just follow the instructions. There's nobody on this planet who "can't cook" given the right ingredients, only those too lazy to try and bother.
Lukewarm water won't cook anything. You might as well eat it straight out of the packet if you're going to do that.