How do I select an object?
To select any object (handwriting, text, shapes, images, or highlights), choose the Lasso selection tool or the Rectangular selection tool from the tool picker, then select one or more objects by drawing around the items you wish to select.
Tip: You can select a single object by tapping on it with either selection tool or select everything on an entire page using the Select all feature.
For a video tutorial, see Squid - Selection Tools. There's also a (outdated 😉) Squid - Tools Overview video that shows a bit more about what you can do with selected objects.