how do I apply for the national coach job??

I want to coach a national team while also coaching a club team but I can't find a way to apply... even when a coach gets sacked, I don't know how to apply.. help!!
ehh... I'm not sure how to do that either. I could only find a way to resign from my current club. And I've seen that when a club manager gets sacked, I could show my "interest" in the job (in the news section) but otherwise I can't find it...
It's all in the manual, but anyway:

In the menu, under "Jobs", is a tab called "Job Security". Click on a team or nation of which the status is "Available" or "Insecure", and there will be an option "Apply for job" or "Declare interest" at the bottom of the menu.