If you want someone else to do it - post in requests forum.
Now I will explain what's the easiest way.
First, you make a new task in plugin_init, with flag "b" and 1.0 time.
In the task function, loop trough all alive players.
Get their index.
Then set the HUD message.
And then you can use these natives to get their XP, Level and Credits in the HUD:
PHP Code:
register_native("RPGx_GetXP", "Native_GetXP", 1);
register_native("RPGx_GetLevel", "Native_GetLevel", 1);
register_native("RPGx_GetCredits", "Native_GetCredits", 1);
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