Simply dropping the blimp off a balcony, stairwell or out of a high window is the safest way to fly it. It works best out doors where it can fly a long distance. You should drop the blimp parallel to the ground (not nose first or tail first) for the best results.
Throwing the blimp with a stone in its nose is your second option you could also use blue tac or soft silly putty. This takes practise and requires you to be very careful you don’t hit anyone. Throw the blimp with the stone grasped between finger and thumb vertically upwards and you can get it very high indeed. It will glide a long way floating like a blimp on the air currents. The first people I showed it to called it the flying fish. I like this name a lot!