QWER are your capital ship ability hotkeys, in order.
It is worth noting that this works for ALL abilities and actions and buildings and any button that appears in their place.
There are two rows of five buttons each in the lower right of your screen. There may be cap abilities, options to build something, planet development options or whatever.
Those buttons always have the same hotkeys.
QWERT - first row
ASDFG - second row.