It’s the golden rule that you should never take up any kind of free spins offer unless you know exactly what you are doing.
Once you are awarded your free spins, they are there until you use them, but they may well have a limited availability too. Do not expect to hold on to your free spins forever!
You will not be able to use spins that you pay for yourself before you have used up your free spins. Other free spins offers have ways in which they are launched, depending on the specific deal. Read more