It is possible to edit multiple notes and chords simultaneously by selecting them with the marquee selector. In order to activate the marquee selector, click/tap and hold anywhere on or around the tab staff, and pull in the direction you would like to select the notes. When you release the marquee selector, the selected notes will become blue.
In order to copy them, click/tap on the Copy button. To paste the copied notes, move to the position you want and tap and hold. A Paste button will appear, previewing the location of the notes if you choose to paste. Click/tap Paste to place the notes.
You can also click/tap and hold the selected notes, and drag them around to move them to a different location.
And to delete the selected notes, simply drag them outside of the tab staff.