Who is a good partner?

[Volcano]

Originally Posted by Querulous

Jimmy Kraud - it says in his abilities he can upgrade/train units. Probably a silly question but exactly how / where can I use this ability ? May be obvious but please advise what to select/press if this something I have overlooked

Go to the Hero screen and click on Jimmy's face. If you have a unit he can upgrade, there will be a dialogue option for it. Bear in mind that if, for example, you have the maximum number of Pirates and you have him upgrade them to Sea Dogs, you'll end up with more Sea Dogs than you can control so you might want to have an open reserves slot to put the extras in.