[Brian]

Welcome to the forums, Spencer! To edit an existing item, tap it once to select the row, then tap it agan after a short pause. You'll see the text cursor activate in whatever cell the second tap lands on.

To copy a single row, just tap-and-hold on it, then select "Copy" from the contextual popover. ("Paste" is another option here.)

To select multiple rows, tap the edit button, then tap the grey disk that appears at the right edge of each row's topic. The disk will turn blue and that row will be added to your selection. Once you have the rows in question selected, you can use the buttons at the bottom of the screen to cut/copy/delete them all.

Hope this helps!