Hi Jeff,
I have created the image below which describes how to do it and the second how to use them, so hopefully they will explain it clearly enough.
Hundreds of Member profiles already exist so check the ones there first. You can do that by looking at them in File / Catalogue Manager / Libraries / Profiles. You can add new ones (right click) by altering exisiting ones. Double click and in Properties you will see the styles on the Basic tab and each can be finely adjusted or you can go to Custom (at the end) and create a totally new one as described in the image.
A few tips:
If you will have the members at angles to each other (e.g. around a cabinet, or guttering around a roof) then make sure the Mitre boxes are ticked on the Details tab. This will join the corners and make them stay connected when you move the members.
Because the Layout tools draw in 2D on the ground, you will have to Elevate them if necessary, once you convert them.
If the profile comes out back to front, then draw the lines in the opposite direction and it will reverse.
When using the Line tool (as against the Rectangle), make the shape all in one continuous movement if possible to avoid breaks. It does not have to be precise as it will need to be adjusted once you convert it to a 3D member, depending on the thickness of the member.
Curves cannot be converted to memebrs but are perfect for making round walls etc.
A related topic:
http://forums.turbofloorplan.com/index.php/topic,867.0.html - I know you have seen this but others may not have.
I hope the explanations are complete enough - ask again if not.
Have fun!!
Allan