Hi Am Using Cream GLYCARE-HQ (Glycolic Acid 10% And Hydroquinone

Hi am using cream GLYCARE-HQ (Glycolic acid 10% and hydroquinone 2%) for thirty minutes on face.
Then wash my face and apply Melaglow cream for the rest of night.

Is it the right way to use these creams ?
Or I have to use it twice or there is some other procedure I have to follow?

So please guide.

Thanks in Advance. :)