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How do I block an outbound connection to an IP address? Cisco ASAA-5510

I have a Cisco ASA-5510 and I'm not comfortable with experimenting with command-line settings.  I use the ASDM.
My ISP is claiming someone in my network is maliciously attacking a a certain public IP.  I disagree but still want to block any inside traffic from reaching that outside IP address.
I don't think the ASDM will allow me to write an outbound rule on the outside interface.  I have the following line hoping to block anyone on the "inside" interface from getting out.:
access-list inside_access_in extended deny ip any 91.20.0.0 255.255.0.0
Is this a correct entry to block any IP traffic from the inside from reaching the 91.20.0.0 network in the real world?
If it is, then my ISP's claim that we're the source is incorrect.
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kf4zmt

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Thanks very much.  -Dave