Hi @Mark Akem ,
The 'Two Dimensional Filter Statistics" is just the name of the dashboard gadget. That can only be changed by amending config files in the file system.
The second part, "ARTEMIS Defects" is the bit that you have more control over. It picks up the name of the Saved Filter the gadget is using. But only the Dashboard owner can change this.
If you not the owner, then you'll need to find out who is.
Hope that helps.
Regards,
Gary