Thank you for submitting a question to Manage My Life.
Both of the links above give some helpful information on replacing the door bellows. Here is a video that demonstrates thiis procedure;
Always unplug or de-energize electrical equipment before removing covers or attempting service. Be careful and wear appropriate hand protection when working around sharp metal parts.
The washer in this video may not look exactly like yours but the procedure is basically the same.
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
Here is a link that you may use to purchase the bellows for your
Whirlpool model number WFW9200SQ02 washer
I hope this is helpful, and if I may be of further assistance please include more details in a reply to this post.