What specifically are you stuck on? Are you not sure where the plot is going next? Or is it that the wording doesn't work for what you're trying to say?
If it's the plot, do you have an idea of where you'd want your characters to end up? The end goal, if you will. Did you make an outline of the plot before or while writing to get an idea of what would happen?
Before someone can help you, you need some more information on what the problem is. The advice could change depending on what's giving you writer's block.