Hi guys

I'm now at the point were I am thinking of adding the AHA to my routine as I bought it on a whim and have never used it yet and I'm not sure were to fit it into my regimen or if I should even use it at all? As I just bought it because 'what the hell!' - the shipping was a fortune so may as well get my money's worth haha! So just wondering if anyone had any advice for me, it would be highly appreciated. Regarding my routine, I follow Dan's regimen however instead of BP at night I use Differin. The use of Differin is why I am not sure what to do here.

Thanks for reading!