Lol some of you people geek me out sorry I spelled nirvana wrong hahahahaha clearly must mean I got it from a bad site right . Assholes. Anyway for you helpfully people I was told to bend the main colla down when I did the stem broke but when I straighted it out it stayed up. Is this not going to grow becusse of the crack in the stem ?
You gotta do it slowly man, your plant has never been trained before so the stem is naturally going to be stiff and difficult the first time. At six feet I'm not sure you can really LST, you may want to look into SCROG, but you really should of posted this when the plant was half the size it is now. You may be able to LST the branches, but it's doubtful.
As long as the stem didn't snap off completely just tape it up and it will heal. If there's no visible damage you just did your first supercrop. Now that I think about it supercropping may work, but you will want to do some more research because there's a fine line between snapping the stem in one direction and breaking it. That and it looks like you're pretty well into flowering now. Any damage that occurs will make the plant put energy into repairing it instead of bud production.