To install the Addon, open a Google spreadsheet. Go to Addons > Get addons and search for Sheetgo. Once installed you can open Sheetgo from the same menu by clicking on Start.
The Addon launches a sidebar which consists of the following elements. In the top header you find the menu button, the logo, a button to expand the connection cards, a button to refresh all connections on the current spreadsheet, and a button to access help.
Then you have your list of connections. You can click on the arrow to refresh a connection or click on the connection card to expand it. From there you have the pencil icon to edit your connection.
A red arrow means the connection did not run successfully. A grey arrow means that this connection only refreshes manually. A green arrow means that the connection is using automatic updates and did refresh successfully.
Lastly, you find the big green plus sign in the bottom right corner to create a new import or export connection or create a template inside the current spreadsheet.