Russel was right, except that you don't need Alt+"Letter"
Pressing "i" would first go to 'Info' in the default popups, then to 'Ignore' when pressed a second time (and you'd need to pres "enter").

Two ways to go...
Assign "n" to 'Info' (hence "i" will shoot to ignore)
I&nfo:/uwho $$1

Or make "i" the activating letter for Ignore
&Ignore:ignore $$1 1 | close -m $1

Or use another letter in the word ignore if you wish.