You simply decided to ignore all of the advice given to you here. Why did you ask then in the first place??
Yes, the site says that this is a possibility, BUT ONLY IF THE TE-OFFICE AGREES BEFOREHAND!! (As I had clearly pointed out.) You have absolutely no right to it! And honestly, it will not apply to your situation.
I already wrote "I did say that you need the TE-Office to agree to the studies. But they will only agree if a) you have been unemployed for a while, plus b) you have no good chances of finding a job in your current field in the foreseeable future, and additionally c) the education you seek increases your chances of finding a job drastically."
Do you fit
a) no, you just got unemployed.
b) no, as you yourself quit your previous long-lasting job, so you might have chances of finding another job.
c) unlikely. Also your current chances of finding a job are untested yet as you have not been seeking any work.
So finally understand that this is no program to help you finance your studies. This is to increase your chances of finding a job. And as you had a job for many years you are clearly able to look for a job again. You have no right to the best education for the best job possible!
So pick up the phone and call your TE-office hotline, and say that you want to talk to your case worker. Then ask him if you can do this. And I bet he will say no, you have to try to find a job first. Only after years of unemployment you might get an assessment that allows you to get further training, when everything else failed and you then seem like a good candidate for that, but there is no guarantee and right, it depends on your assessment.
And also the government is giving the TE-offices less and less money, so the funding in this pot is going down. Fewer and fewer people get it every year. It is reserved for special cases, and also mostly for vocational training. You wanna become a plumber - you might have chances of getting funding after several years of unemployment.