well first you make sure that your object is grouped together then you click on the upside down triangle next to create...then you click on the library you want to save it to like user then click on add give it a name and it is saved after you click o.k...then you click on the thumbnail of the obj and then you click on export it will give you the option of saveing it in what ever folder you want like in my documents my object files or whatever you name it...hope this helps a little in order to save as obj you need to make a big rendering of the object close up then you export image into a folder then you click on the second or third triangle next to your working window/camera moving buttons and find mask click on it and render again then export the image into the same folder as before...now make sure you render it real huge...then save your model in creat library after you save it delete it from your scene then click on create then click on the symmeritic lattice(the spinng top thingy)and then click on the E next to the model in the next library you will see the option NEW click on it then click on the tab PICTURE and import the first pic you exported then import the second pic(THE MASK)THEN CLICK APPLY then you can smooth or roughin the object but it will only be a 3D object if you extrude(pull)the sides add your textures and away you go you then can export the model as an OBJ or 3DS there are several options there...hope this helps