Synthetic wigs are heat set into a particular style. Therefore, they are somewhat resistant to change. You can adjust the location of the part by continuing to part it in the desired area, reminding the fibers where you want them to go.
Always use an appropriate synthetic wig brush or comb. Your manufacturer also makes a full line of products for your wig to help with styling ease. Jená Creations offers these products and will be happy to recommend the appropriate items to you.