The door seal is not that easy to replace in this type of washer. If you do not get it installed properly, it can leak. I provided the basic procedure for replacing the door boot in the image below. Before attempting this procedure yourself, I recommend that you thoroughly review the procedure and make sure that you are confident that you can complete the repair. If you are certain that you can properly install it, the procedure below should help you replace the door boot.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services