On the assumption that one has free will, which seems probable (regardless of whether you believe in a supreme being), the freedom relates to the fact it is you that will be making the choice, rather than some force that set things in motion long before your time. Based on your experience, there may be only one outcome (for the sake of argument), but the situation determines that outcome, and you have determined, and thus chosen, by recognizing the particular circumstances involved, what part of your experience to draw from in making the decison as to how to proceed.
When we talk of randomness (or of chaos if you will), it has to do with a different part of the debate, which is whether or not natural law, or the process of cause and effect, allows for other than an inevitable chain of events from whatever we envision as the beginning of our time. Randomness argues against inevitability and puts us in a position where we can be a bit more confident that the ability to make choices in life is ours rather than some unknown force of nature.
Thus if the situation referred to initially did not necessarily come about through predetermination, the choice we made in reacting to it was not necessarily predetermined either.
But if you believe in God, then you have to also consider the possibility that your particular God may have made the choice in advance, and randomness and chaos are perhaps figments of a physicist's imagination. And then you may be back to square one in this debate - and I use the term debate advisedly.
