Hi
You are already showing related products. If you only want to show accessories, try changing this:
HTML Code:
<!-- Related Products List -->
[DFR:Related Products?c=%ci]
<!-- /Related Products List -->
To this:
HTML Code:
<!-- Related Products List -->
[DFR:Related Products?c=%ci&word=accessories]
<!-- /Related Products List -->
Here: The Factory > Your Store > VIEWS > PRODUCT DETAIL > Default > Text module.
Eric