Hi (enter your name here),
Welcome to IceInSpace
As advised above, start off in the day time.
I have an 4SE which is similar.
Firstly set up the scope outside.
put your lowest powered eyepiece in (probably 25mm).
Take off the caps.
Look through the eyepiece adjusting focus until you can see something.
Then slew the scope to some distant object (tree, light).
THEN, adjust the finder to centre on that object.
This will not be totally accurate for DSOs but will get you close enough and you then fine adjust at night on a bright object (Sirius etc.)
If in the daylight you still can see nothing, check that there is not a filter screwed onto the bottom of the eyepiece. If still no good, report back as to whether (in daylight) it is a White nothing or a Black nothing. Take the eyepiece out and look into the diagonal to see if the light path is compromised.
Hope this helps some, and please report back to let us know.