"Nano" is a prefix, like centi or kilo or micro, that denotes the quantity of something. For instance, a "kilogram" is one thousand grams and a "centimeter" is one hundredth of a meter. Nano means one billionth, which is very, very small. A nanometer is one billionth of a meter, the scale of atoms and molecules. A nanodecade is the blink of an eye.
So a "nanobite" is a billionth of a bite. It's probably a play on "nanobyte."
A nanobit is a very small unit of data, and it is equal to one billionth of a bit. Since there are 8 bits in a byte, this means that one nanobit is equal to (1/8) of a nanobyte. Consequently, one nanobit is significantly smaller than a gigabyte, which is equal to (1,073,741,824) bytes or (8,589,934,592) bits, making one nanobit effectively negligible in comparison.
To change your Nanobit ID in Superstar Life, go to the settings menu within the game. Look for the option that allows you to manage your account or personal information. From there, you should find the option to change your Nanobit ID. Keep in mind that changing your ID might have certain restrictions or requirements, so be sure to follow any prompts provided.