Hi! Glad
@tootall_2012 could help you with this. As he mentioned, it's a strategic bomber, so you'll need to press "K" (I think - better double check the docs but that's what I usually use) to use a munition. To rearm, simply land at a base. This prevents it from attacking over multiple turns given its time aloft. Basically it just checks to see if it has a home city or not (you'll notice after you attack, the home city will be "none" and "k" won't work any more).
Glad you're enjoying the scenario!