How can I pop my hip back into place?

You can't. When a hip dislocates it is nearly impossible to reduce (put back into place) without anesthesia and a significant amount of force. If the hip is truly dislocated you couldn't put it into place by yourself.
Not dislocated. Usually when the hip "pops" it is consistent with a snapping it band. This generally responds to therapy.

Related Questions

How can I pop my hip back into place?

Not likely. It's not likely that it's out of place. Something else must be going on that's making you feel this way. Without other symptoms mentioned it's not clear what this could be. If you are having problems with movement, bearing weight, then a full evaluation should be made. History is also very impotant- eg. A recent history of trauma or a joint disorder would influence a diagnosis in this case. Read more...
Not out of place. The hip is a very stable joint and does not dislocate easily. If you feel like there is something moving in and out of place, you may have a labral tear or a tendon/bursa problem. See a board certified orthopaedic surgeon for evaluation and treatment. Read more...