Hope for Improvement

I previously posted about the issue of my friends and I being on different servers. Later, my friend happily purchased an in-game item (using game currency) that allows server transfer, only to find that we couldn't locate instructions on how to use it to change servers. Also, I downloaded the game earlier, and even though the servers are full, some people haven't logged in for a long time. Can't something be done about them occupying slots?