You have to create a shortcut to your "da2.exe" file first. This file is usually placed in the C:Program Files(x86)Dragon Age 2bin_ship folder) on you system. For making a shortcut go to Start menu, find the shortcut of da2.exe, right click on it, open "Properties" window and add the following to the end of line in the "Target" field: -enabledeveloperconsole — it should look something like this: "C:Program Files (x86)Dragon Age 2bin_shipDragonAge2.exe" -enabledeveloperconsole.

After that manipulations are fulfilled type the required commands into console. Console is activated by pressing "~" key. Some notes:

1) you often won't see any notification that something has changed

2) you will not see the console, or what you are typing - this is normal

3) console will automatically closed after you will press "Enter" button.