You will need nettool to remove players, remove the password from a player, kick and ban players, etc. regardless of whether or not you compiled the server yourself. You can't do any of this from public service.
Here is an old compiled nettool I have lying around my computer. I have used this to administrate all of my servers in the past without issues, but I don't really know how old it is or where it came from (I don't think I compiled it): http://simutrans-germany.com/files/upload/nettool.zip
If you run nettool.exe from the command line it will tell you how to use it. You will need to restart your server, and add a command line flag
where xxxx is the password that you will give nettool to allow you to access the admin functions.
I'm in your server (Player Name RF&P) so feel free to chat me in game if you are trying to figure more of this stuff out.