First the problem with your code is all registers should be in plugin_init not outside functions and then youre naming all motd functions the same so it wont work rename them to for example showmotd1 both in register and the function itself
This will make a blue hud
Code:
set_hudmessage(0, 0, 255, 0.75, 0.01, 0, 6.0, 15.0)
show_hudmessage(id, "If you write /allmaps")
If someone else dosent show you ill fix it later im a little busy now...