I purchased the two extra ship slots but I'm not sure how to activate them for my Captain? I checked with the search function but found no posts relating to this so apparently I'm missing something quite obvious.
Hmm I purchased these while accessing the store from the log in application. Which means no captain was actually logged in at the time.
if you look at the c-store page on the site just above the circle where you points total is it says which captain you have. you can switch characters from the page, so what ever characters was selected should be the one it went on.