Everytime that I click to join a KQ it alwats says "Can't find Kingdom Quest":(. What does that mean ? Can somebody help me?:(

its gotta be the right time for it to take place, and to even get in, your timing has to be perfect.

You simply, ckick on "participate" button at a wrong time.
First you can see the time for each and every KQ, let's say it's written 9:32 - 9:52, that means that the "recruit" time is within this minutes. You stay near the town chief and wait when time will be 9:32 exactly, then "recruit" word will appear, simply click as soon as possible after "recruit" status is shown and you will be in KQ.

If you ckick before status changes into "recruit" then it will tell you that the KQ cannot be found, or if you click when "recruit" status is shown, but there are no more places and KQ is full, then you will be said that - there are too many participants.

If you face any problems, just log off and log on within one minute before the KQ and you will have more chances to get into KQ.

Best of luck!

if i have not mistaken. there is currently a bug in apoline's king slime kingdom quest. so.. yea.. they prolly fix it up soon. i think its due to the xmas patch