How do I add a electrical junction box?

What are you attempting to accomplish? Junction boxes must be accessible and cannot be sealed in walls or closed ceilings. They can be installed behind mirrors that are moveable, inside wall or floor cabinets, inside closets (not recommended) in attics and open basement ceilings or above a dropped ceiling. Tell us your plans.

Bob, how many threads do you need going on this one topic?

https://www.askmehelpdesk.com/search.php?searchid=20165517

What are you attempting to accomplish? Junction boxes must be accessible and cannot be sealed in walls or closed ceilings. They can be installed behind mirrors that are moveable, inside wall or floor cabinets, inside closets (not recommended) in attics and open basement ceilings or above a dropped ceiling. Tell us

your plans.

THE room already has an electrica junction box . I need a second junction box for a track lighting fixture.pls. tell me how

Bob, how many threads do you need going on this one topic??

https://www.askmehelpdesk.com/search.php?searchid=20165517
What, do they charge you every time I drop a thread? Cmon bro..

Come on nothing "bro". I replied to your thread this morning, now you post the same thing in a new thread with no new information or details. That is annoying and confusing to those trying to help you.
If you obviously don't care enough to use proper forum etiquette then I don't care enough to help.

THE room already has an electrica junction box . I need a second junction box for a track lighting fixture.pls. tell me how

Why another Jbox? Can't you pull a wire from the first? Where is the first one located?

Bob track lighting generally does not need a drop down box. Depending on where you live, code prevails on how this is supposed to be installed. A junction box is (if I may) a simple distribution point, where wires extend from. Mounting the box is self evident usually two screws or two nails does the job, if you need it between two joists (thinking track lighting mounting surface) the junction box has two metal arms that can be attached to the joists with screws and you cut a hole in the ceiling to provide access to the mounting surface. The wires for the lighting can be attached from the closest circuited box and run to the new box. Bob this is not a job for someone who knows little about house wiring. I know electrical guys can get expensive but fires a far more expensive you really should hire the job out.