I think what you're really asking is how to improve your hip flexibilty. The folks above are right, it won't happen overnight ( despite matt fureys ( ex-world champ, combat conditioning author / creator @
www.mattfurey.com ( btw : sign up and he'll send you daily emails with everything from motivational jazz to health advice

) claim to have a system to that effect. If you stick at it consistently, there's only improvement.
A good stretch sequence you can try for hip flexibilty is :
Find a gate or bar or a sofa will do ( anything at butt/ hip lvl), sidekick from chamber to rest foot on bar. Once up there hook the top half of your foot around the bar and elongate elevated leg and gently pull/stretch out from your hip, leaning slightly out of it as you go. After this, turn your grounded foot around , turning from your hip as though your elevated leg is half way through a back kick. relax that back leg and put your weight into the grounded one. If you can manage it, again pulling out from your hip, come down spine straight, rolling as you get to the ground to put palms either on the ground ( grandually adding a gentle twist to opposite side as elevated leg as you improve ) .Re;ease spine and come up dpoing standard chin / chest to shin / ankle stretch while grabbing the middole of your underfoot. After that place your palm on the inside of your foot lean into it and turn your foot toward the outside until you can get your outer foot flat to your bar. DO NOT break your ankle or force a pulled muscle doing this , a little at a time is ample!! Then repeat with the other side. I also find that a good monkey stance ( really low mabu ( wide squat) drop pelvis and roll toward the back ( as in butt pointed high to back wall) and force legs out with elbows, keeps me loose in my hips as well.
1 more:- I also like to sit on the floor spine straight , pelvis tucked back just a little, ;legs together and straight ahead. Point toes and lean in as far as poss. roll back up and turn soles of feet together, lift slightly and extend as you lower. turn feet aiming for inner blade ( instep) either flat on floor , grab ankles or outter blade and ease chest downwards.
Really good stretches but better to go slow than get injured.
Enjoy!
BL