Under “Album Admin” -aka “Manage Albums”- click on the Seq link (stands for Sequence) to order the photos in each sub-album [by drag/drop].
If you select your main album (=years-folder) you can also re-order the sub-albums therein with the “Seq” link, again by drag/drop or by using the “up/down” arrows.
It should be plain-sailing … unless I have misunderstood your question…