Did you find something wrong with the plugin? I’m trying to figure out how not having a screenshot for the plugin deserves a 2 star rating? Did you even install it?
If you did find something wrong, there are multiple places you could ask for help. Github (https://github.com/wppush/pushover-notifications/issues), the site linked in the description (https://wp-push.com/support/) which has some screenshots, or even the same site this review was submitted from.
This plugin has been through many updates, and hasn’t been in ‘Beta’ since 2012.
