Here you have the lab page with menus at the top along with the explorer, search and the outline icons. 

Click on the New Terminal submenu under the Terminal menu. 

Click and drag the new command terminal at the bottom to the top. That'll look convenient.

Copy the command/s you wish to use from the Lab window.

Paste it in the terminal window and press enter. 

For better viewing, split the current terminal into two by clicking the Split submenu under the Terminal menu.

You can as well work with the already existing files. Click on the explorer icon, choose the file, modify the code and save it.

Open and work with many terminals and files at the same time.

Save the frequently used set of files and components of your working interface in a separate workspace for reusing or working with them over and again.

To create a workspace with the current components, click on Save Workspace As.

Choose the location, enter a name and click on save.

To open a workspace choose on any of the menus - Open, Open Workspace and Open Recent WorkspaceOpen Recent Workspace is a convenient way of choosing the recently created or opened workspace.

Check out the common options in the Edit menu for editing text in your files.