+1. do not ride it at all. alloy cranks are soft and the bottom bracket axle will irreparably damage the crank.
+1
Take of the black plastic dust cover with the two holes - use any old thing to get if off like a knife or pen stuck into one of the holes and gently tap it around with something else like a rolling pin or book.
Under this you will see a crank bolt or some description - tighten it up.
DO NOT RIDE YOUR BIKE WITH THE CRANKS LOOSE LIKE THIS, EVEN TO THE BIKE SHOP !!!
+1
Take of the black plastic dust cover with the two holes - use any old thing to get if off like a knife or pen stuck into one of the holes and gently tap it around with something else like a rolling pin or book.
Under this you will see a crank bolt or some description - tighten it up.
DO NOT RIDE YOUR BIKE WITH THE CRANKS LOOSE LIKE THIS, EVEN TO THE BIKE SHOP !!!