Ok I've seen a lot of threads with all these tools and stuff you can use in order to train your XP skill (robot,water elf,etc.) and personally, I know I dont want to go through all the trouble so here's an easier way.
1. Wait for XP circle to be full, pick your desire XP skill and drag it into one of the Fslots.
2. Use a piece of tape or something heavy to hold that Fkey down on your keyboard.
3. Leave everything alone and it'll automatically keep using the skill when the XP circle is full.
*note: In order for this to work properly, you have to leave everything alone after you've found some way to hold the Fkey down. To check if it worked properly, on the top left corner it should keep saying "You cannot use this magic skill yet" or something like that.*
1. Wait for XP circle to be full, pick your desire XP skill and drag it into one of the Fslots.
2. Use a piece of tape or something heavy to hold that Fkey down on your keyboard.
3. Leave everything alone and it'll automatically keep using the skill when the XP circle is full.
*note: In order for this to work properly, you have to leave everything alone after you've found some way to hold the Fkey down. To check if it worked properly, on the top left corner it should keep saying "You cannot use this magic skill yet" or something like that.*