The Glitch Editor supports multi-line editing.
If you have identical lines of code you wish to edit, you can select one line of it and use the following keyboard shortcuts to select the other lines of the same code:
* For a Mac, Cmd+D
* For a Windows machine, Ctrl+D
You can also use Cmd+Click (Mac) / Ctrl+Click (Windows) in multiple places to create multiple cursors and work from there.