Either someone who knows how to update a plugin or simply able to guide me to someone who does know how to update a plugin. I'm not looking for how to drag and drop an updated file, I'm loking to update the file myself... But I don't know how...
You'd need to know java code, and how to work with the files that java uses (ie, how to convert your projects into .jars).
No clue, then. I would imagine you'd just start editing the plugin, have the latest bukkit jar in its library, and correct all the errors, but I wouldn't know how to do that.
I really don't mean to be rude bloisjo013 But if you knew how to code, you'd know you don't just "put stuff in jars". You'd also know how to read an error, solve it, and fix it correctly.
Mostly you have to rewrite the Config- and the Event-System of the Plugin. The rest is almost not changed by Bukkit in a long while. If you know how to code, this is in most of the times much work but easy to modify. If you don't have the actual source, it gets more complicated. You therefore have to decompile the jar and hope you get working code. If you don't have the code, ask the author and just hope, he gives it to you (easier than decompiling).