Never used them but they look like regular twistlocks. What exactly is the problem? If they are stuck tight and you can't get any grip on them, you might need to use a pair of plier to unlock the bottom section. Pictures help too.
If they are twistlock and won't lock, they probably need to be taken apart and cleaned. If they don't need cleaning, they just might have been loosened too much. The solution to that is to take them a part and adjust the twistlocking mechanism until the wings are spread as far as they can be and still fit into the pole. After doing that they should lock. They might also have been loosenend so much that the mechanism has come apart. If so do same as above for too loose.