Ah, right. Have a look at the workflow to start with. The "close" transition needs to have the resolution screen added to it, then it will pop-up as you try to close issues.
Note that "simplified workflows" sometimes seem to break this - they lose the screen and don't set the resolution properly when moving into "Done", but it is safe to add the screen back into them.
Just to expand a bit on what Nic mentioned, you would have to set the transition view for the transition that closes the issue (usually either 'Resolve Issue' or 'Close Issue'). I'd recommend that you take a look into these documentations for more information :
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