If you do not know how to log in to the Customer Portal, please see this article.
On the menu bar, click SERVICES, and then click MY SERVICES.
Locate the specific MWP account you want to enable Jetpack on, and then click Manage.
Under the Hosting Information box, click Login to Plesk.
When the next page appears, click WordPress in the left navigation bar.
Identify the specific WordPress install you want to enable Jetpack on and click login.
Under example.a2hosted.com/wordpress, select Plugins. Jetpack should be under Installed Plugins already if this is a newer account. If it is not, follow the steps below.
Click Install, and then search for Jetpack. Select Install for Jetpack. The plugin installs (this may take a few minutes.)
In the WordPress section of the Plesk control panel, next to Remove, click Manage in Wordpress. The Jetpack configuration page appears:
Click Set up Jetpack.
During the next step, you are prompted to log in to your WordPress.com account. If you do not already have one, you must sign up for one.
Once logged in, you are asked to choose from several options such the specific account plan you would like and what features you want to be enabled (e.g. stats.) Jetpack finishes the setup process. You are redirected back to your WordPress install. From here you are all set with the activation process and can continue to customize and configure Jetpack.
If you're coming across issues installing Jetpack, contact A2 Hosting’s customer support LiveChat, where a customer support representative will be able to lend further guidance on resolving the situation.