Once you have installed PushOwl (follow the steps to install here) on your BigCommerce store, you would be able to access the PushOwl dashboard by following below instructions.
1. Select "Apps" from left navigational menus on your BigCommerce dashboard
2. Click on "PushOwl Web Push Notifications"
3. You will be redirected to PushOwl dashboard, which you can use to configure your Push Notification Sign-Up (OptIn) forms and start sending campaigns.