Board Thread:Questions and Answers/@comment-29651034-20170629230627/@comment-28112544-20170630002415

First verify that the flash is working by going to https://helpx.adobe.com/flash-player.html and click Check Now.

Then at the KanColle page, click on the little icon to the left of the URL (an "i" with circle around it), change Flash from "Default (detect)" to "Always allow on this site."