Thank you for your post.
Tap the double-window button in the upper left corner. Then, tap the "x" icon in the upper left corner of the document to close it. This will bring you back to the FileMaker Go home screen where you can select the "Files on Device" on the left side (probably Getting Started), and on the right side are the Remote Files and Hosts along with Recent Files. If you need to connect to a remote file, then tap magnifying glass icon, select the remote server, and select the remote file.
Let me know if you need additional clarification.