difficult installation.

hello,
I Bought pro stripe and I installed it in my wordpress site but does not appear in the paramettres WooCommerce and I know how I began taking input all keys and at default settings I paramétré.j’aimerais really do not know what it is the customer who enters the amount to be paid at the end of the commande.sil please help me this is urgent.

https://www.ads-software.com/plugins/stripe/