Buying a toilet seat isn't enough to solve your problem. If you're not observant, you may have an incompatible toilet seat.  To prevent this, you should first check and confirm that the shape of the toilet seat matches that of the bowl. Next, you should get a measure of your toilet bowl's dimensions and compare it to that of the seat.  If you are unsure of the accuracy of your calculation, please get someone to help you. Better still, search for adjustable toilet seats. Feel free to ask if you have any other general questions regarding toilet seats that don't move. However, if your questions are about specific brands, it would be best for you to contact the brand's customer care or support.