How to get online prescription for anti depressants?

Talk with your doctor. The costs of drugs vary a great deal. Also you can call your local social services (211?) and ask about what's available. In some places people can get free therapy for depression. This is about the ACA (Obamacare).

https://www.healthinsurance.org/obamacare/how-obam...

Also, don't overlook self-help, which many people benefit from. There are healthy lifestyle things that help with our moods, and they're mostly easy if not downright fun. Even exercise is easy if you do it right - start off with something light and add to it gradually. I would talk with the doctor though about strenuous exercise, and don't make yourself sick of exercise with too much and quit. 

This answer has details, under DEPRESSION TREATMENTS - 

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Of all the traditional Asian methods (meditation, tai chi, etc.) the one with the best evidence for helping people with mood problems is controlled breathing. I have information about therapeutic breathing recommended by psychiatrists Brown and Gerbarg and PTSD therapist Emma Seppala in my answers. This is safe and requires no training.

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Only if you can get your doctor to approve it then you can. If not, then you should look at some natural ways, they actually solve the issue rather than suppress it like meds do

You can dance, for inspiration. Come on. I’m waiting.....