membership configuration quesrtion

i Installed the membership plugin but i didnt see any registration / login option from my main website , how can that be fixed ?

i want that some of my content will be visible to the guest users who dont need any registration , and some of the content which need free registration, and i selected the FREE gateway option from the settings , but its not working as the members / users are redirecting to paypal for 0.00 amount which i dont want , how to fix that.