There is a sign below the page.

" Old Version"

I like the new AFF but well, it , Unm~ Idk how to say but I rly prefer to the old one.So I change the old ver:

I dont like it too it got crazy and i missed the old one

at the very end of the page there r a list of options.....n below the option advertise u'll find the old version option...n as for subscribing, its like the same as the old one...just click on the story n in the foreword page u'll find the subscribe option beside the upvote option, just click on it and voi'la , u r subscribed..
I hope this helped! n btw....HATING THIS NEW AFF....I am still using the old one though

in the home page there is a gray box on the right "switch to green theme"
^^

It's freaky, tbh I liked it better when it was green and wasn't this... modern looking?? AFF's updated so many times, it's starting to freak me out .-.

below one option says old version press that u will brought back to the old ver of aff