In order to save data in your Unity game, you can use "PlayerPrefs" to save and load.
This tutorial shows you a simple way to save and load data between scenes.
If you are new to Unity, this step by step guide will be the right video-tutorial for you!
You also can delete your saved "PlayerPrefs", if you want to get rid of them.
This tutorial shows you a simple way to delete the data you saved with "PlayerPrefs".
I will try to upload my tutorials to d.tube in the future, but at the moment i get a lot of errors trying to do it.