The wing is held on by two bolts(hex head bolts going into blind nuts) at the rear end of the wing and two aluminum pins at the front. This is illustrated in the manual rather clearly. There are two circular white plastic pieces with 3 screw holes that you screw into the forward wing saddle section for where the two aluminum pins slide into.
What you will need to do is:
1) Build the wing...all servos, landing gear, etc and join the wing halves....do NOT glue down the bottom wing/fuselage piece yet
2) Line up the wing in the wing saddle and measure to make sure it it centered and then tape the wing down to the fuse
3) One of two ways to line up the aluminum pin hole locations on the front of the wing:
-A)drill thru the front firewall with a long drill bit thru those pin holes into the front wing saddle. Use a drill bit that is the same or slightly smaller diameter then the alimunum pins...easiest and most accurate way
OR
-B)Carefully measure the exact spots on the front of the wing for where the aluminum pin holes should be drilled. You must be very precise with measurements or the wing will be off center once you glue the aluminum pins in place...you will drill these spots manually when the wing is not in position on the wing
4) Now....with the wing still taped down in place.....at the back of the wing saddle area..there are wood plates glued in the fuse to accept blind nuts. Drill thru the wing into those wood plates. Install blind nuts......then use the hex head bolts to secure the trailing edge of the wing to fuse.
5) Now you can affix the bottom wing/fuse cover. You will need to drill out/open up the two circles located on this piece to gain access to the hex head bolts. There are white circular rings that you glue into those holes for a clean appearance.