There are many reasons you may need to access your WordPress files, such as installing a custom theme, editing a config file, or backing-up your website. Managed WordPress includes a File Browser so you can view, upload, download, move and edit your WordPress files without using FTP. The tool also includes several more advanced features.

Go to your TsoHost Client Area account: https://my.tsohost.com/clientarea.php

Navigate to Services -> My Services -> select the Managed WordPress service -> click on Login to Server

From the Managed WordPress Dashboard simply navigate to Tools and click on Open next to File Browser.