You will not find a manual for these small telescopes.
This is a small refractor telescope-- they pretty much all work the
same-- BUT don't expect to get more than 100 power out of the scope. Yes
I know the box said 600 power but it's a lie. In my 8 inch telescope I
rarely get above 250 power and my scope is many times larger than the
one you have--
Now put the eyepiece with the largest number
written on it into the telescope-- the LARGER the number the LOWER the
magnification. During the day time practice focusing on a distant object
--- AND line-up the small finder scope on top with the main telescope
tube. Look at the top of a distant light or church steeple, or telephone
pole. Without moving the telescope adjust the small finder scope by
loosening and tightening the screws around the tube holding the finder
scope-- put the crosshairs on the same spot as the main telescope.
you can use the small finder to locate objects in the sky-- the moon
should be your first night time target.
and my TIPS on my profile page.