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Here is a video that demonstrates removing the filter on a dishwasher similar to yours;
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 dishwasher 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 view the parts list diagram or purchase any parts needed for your appliance;
Sears Parts Direct
I hope this is helpful. Check the things I have covered here and if I may be of further assistance please reply to this post.