You will now need to stand up your frame. Make sure that it is "square" off the wall and that this is the correct dimension you want to work with (your preference). Once your frame is square (makes a 90 degree angle with the wall) you can fasten it to the wall by screwing through the end stud into the wall (make sure to use your level to ensure the frame is plumb).
NOTE: I made my bar run the length of the room so I did not need to fasten my bar to the floor. If you choose to make your bar not run all the way, you will want to fasten the bottom plate to the floor using nails or concrete tapcons. Do a simple google or instructable.com search to learn how to fasten a plate to the floor.
At this point your bar should look like the following picture.