Well panning needs a good deal of practise, or... a bit of luck ;-)

OK, in order to have the background blurry, the background has to move in your frame a meter or two during your exposure. It will move more when

• you are further away from the background
• your focal lenght is longer
• the subject moves faster
• the shutter is slower

The first point (further away) is a good one. The other 3 methods introduce new issues, mostly that your subject will be more blurry.

So start with this:

Choose slower subject (pedestriants, bicicles or similar, at a place, where the background got clear contours but is 3 meters or more away from them. Then photograph with

50mm, 1/15s, f11 or similar, ISO800 (or whatever is required for your light)

Like always breath out and hold your breath during your exposure. And press the shutter button super-super-gently. This adds a lot to the sharpness and clarity of your subject.

There is an awesome film where the great Yuri Acours explains all of this breathing and holding techniques:

Yuri Acours Microstock Photography Workshop

just if you are interested. You need to be registered with FotoTV to watch the complete video, but FotoTV is anyway really worth a registration. And probably they have a trial or something.

Hope this helps.

Thanks to @astridMarpaung for the question.