Problem with unfolding

[Arg Arg]

you are able to change the UV-Map in the UV-Editor.

select some edges and choose "CUT" and you are can separate some faces.

if you have separated a bunch of faces you have two options:
- while the face is selected (in face-mode) you can choose the command "Project-Unfold"
- while in object-mode you can choose a separated face
or a bunch of separated (connected) faces (also called UV-Islands or UV-Shells) and
choose the command "ReMap-UV"

now, you are able to combine single faces (or a bunch of connected faces / UV-Islands/ UV-Shells)
to each other with the command "Stitch" in the edge-mode (select a edge an choose "Stitch").

the best way is to start with a trouble-free unfolding, which you can achive by
selecting the right edges and mark them for cut before you unfold the uv-map.

as Micheus mentioned, take a look at some youtube UV-Tutorials.
there are less tutorials about unwrapping UV´s in Wings3d ...but no problem, you can
also watch Blender-UV-Unwrap tutorials and to learn how it works.

here i found a Wings3D-UV-Tutorial on youtube made by youtube-user Age of Armour