connecting to polygons
 

can anyone tell me how to combine two polgons together...what i did was select one then the other while holding shift but one is green and the other is white and then i go to booleans and press union but it tells me that two must be select in order for the operation to work???? weird i dont know help please

Booleans are used to interpret suface overlaps, not to actually join or generate new geometry.

Select both then go to the menu POLYGONS-> COMBINE

then they will be 1 object. Note that you will still have to merge the verticies that touch when you put them together.