If you aren’t already aware there are some helpful tools for Azure websites found at https://YOUR-WEBSITE-NAME-HERE.scm.azurewebsites.net. For example if you website name in Azure websites is mikmeh than your scm URL would be https://mikmeh.scm.azurewebsites.net. You’ll need to be logged in, or login to view the site. Lets assume you already know about this and you also discovered the site extensions gallery and you clicked the install button for phpmyadmin. Then after it installed you clicked the play button and you get this.
No route registered for '/phpmyadmin/
There is a super easy fix. Just stop your website in Azure. You don’t even need to start it back up, the scm runs under a different worker process. Now you have phpmyadmin the super easy way. It even connects to your existing databases.