In your Wordpress Dashboard, go to Plugins > Add new as illustrated below.
Click on Add new will be redirected to the plugin installer page.
Select the package file and click Install
After installing plugin, go to Plugins > Installed Plugins and find the Axis Subscription plugin and click on Activate to activate the Axis subscription.
Once you activated, Axis subscription will be listed in the Wordpress Dashbord menu as like illustrated image below
After successfully installing and enabling Axis Subscriptions plugin, go to Axis Subscription > Dashboard. The step-by-step configuration wizard will be appeared.
It is the basic configuration step where you should provide basic details (such as address, city, country) about your store's location.
If you wants to use Paypal as your payment gateway, provide the merchant email address and click next. If you don't want to configure paypal, just skip the step.