Editing Meshes

I hope this is the right place to post. Anywho, I am a sims2 game player and content creator. BUT, I want to create/edit meshes for the game also.

Today I tried editing a mini skirt but I could not figure out how to select parts of the meshes after importing the bottom.obj (the mesh) into Blender. Can anyone help me out on this one?

You may have imported it while in edit mode.
Try re-importing in object mode.