Loading bitmaps

I’ve been learning AS3 for a while now, and it’s my first Actionscript language, but not my first coding language. I’ve learned a lot so far, but I started off doing things in the not so efficient, or correct ways. I was putting all of my actionscript on frames. I’m trying to get in the habit of doing it the right way now. But I’m having a basic problem. I can’t figure out how to load a bitmap from the library in AS3. Can someone help me please?