Go to www.taurususa.com and look in the product manuals section for a 'Metallic Semi-Auto Pistols' manual. It will have the diagram for removing everything and even flipping over the mag release if you so choose.
Are you talking about how to remove that lever and pin? I'll have to go pull out a PT to check for sure (but that's ok I have a new PT92 that I need to do the initial cleaning on). But, I was thinking that it just flipped over and pulled out. Now there is a sequence that needs to be followed in the take down process.
On that lever, when you remove the slide you push the button in from the other side and move the lever downward to allow the slide to remove. To remove the lever, rotate the lever upwards and around then it will pull out. Keep your eyes open for a small spring to be launched as you pull the lever out.