Click on File
Click on Open

or

Click on the Open File icon 

You will now see the pop-up screen( a small screen with options) appear on your screen (see below).

This pop-up screen (above) will give you all the information you need to be able to find the file you are wanting to open. The first place to look is in the Look in: line at the top of the screen (circled for  you here). The name of the storage folder should appear there. For instance, if you saved the file in a folder called data you are in the right place. Now you have to look below the Look in: line to see the names of the various sub-folders and files that are in the data folder. In this example we are hoping to open the file called Markbook.

To open the file, click on the file name. It will look like this once you have clicked on it:
Markbook

Now click on the Open button on the top right of the pop-up screen.