Cursor bounces around, doesn't release when highlighting

Cut and paste is as simple ah highlighting the word by holding the left mouse button down and dragging over it and then right click on the page and select copy OR you can highlight and use ctrl c to copy and ctrl v to paste

Make sure your fingers aren't on the screen. That makes the cursor jump. Even holding the device with your fingers too close to the screen will cause that too.

Press Fn & F10. This disables the touchpad. You will have to use arrows or a mouse to move the cursor. This helps when you are doing a lot of typing. Press the same keys to enable the touchpad when you are finished typing.

If the shooting information is not on the display, press the [i] button to bring it up.
Press the [i] button to put the cursor into the shooting mode display.
Use the cursor pad to highlight the shooting mode (fifth item from the top along the right edge of the display).
Press [OK].
Use the cursor pad to highlight the one-handed clock and press [OK].
Press the shutter release button halfway to focus and meter. Press the shutter release all the way to start the self-timer
Full details are in the "Release Mode" section of the manual (page 35 in my copy). If you need a copy of the manual, you may download one here.

Are you using the touchpad or an external mouse?
Douse it jump around while typing or when you move the cursor?
If you are using the keyboard. try turning it over and tapping it LIGHTLY against your hand or something soft. There may be some dust or stuff between the keys.
John

Set the camera's release mode to one of the two remote modes. Quick-response remote mode fires the shutter when you press the button on the remote. Delayed remote mode gives you two seconds to hide the remote behind your back before firing the shutter.

To set the camera's release mode, press the button to bring up the information display. Press the button to put the cursor into the information display. Use the cursor keys to highlight the release mode (fifth item from the top along the right edge) and press OK. Use the cursor keys to highlight the desired mode and press OK.

Full details are in the manual in the "Release Mode" section (page 53 in my copy).