where can i cancel auto renewal of an iphone app?

i have followed the instructions - prior to the original msg - the "Subscriptions" do not appear in my iphone Settings at the spot indicated - the app has downloaded but i have not used it - it has a 7 day free trial - is it possible since i haven't used it my subscription hasn't registered? - since this app has a $40 charge i want the subscription cancelled - more links will not help - i have found and followed all instructions on links - it has now been about 12 hours since i downloaded - is it possible registration of the subscription has a lag? or the subscription doesn't start until first use - if the latter is true should i just delete the app unused?

thanks - i already deleted it opened but unused - is there no place to ask someone from Apple?