I found Ursa major, but ............

You can check your latitude on the map first. For example, 28 degrees north latitude, you should look for it at 28 degrees from the horizon. If the building in the north of you is very high, and the line of sight on the roof is higher than 28 degrees, you will be blocked by the building and can't see the North Star, so you will see other buildings in a short place, and so will the mountains. Polaris is slightly darker than the six stars in the Big Dipper. If you can see every star in the Big Dipper, and you already know that Polaris extends five times in the direction of the Big Dipper, then you can definitely see Polaris.

If it is a big city, the lights are very bright, so you should search carefully with a telescope. The telescope has a focusing function, which can make Polaris bright in the telescope. Telescopes should use professional telescopes, such as astronomical telescopes. Ordinary binoculars are useless. When searching, because I don't know the length of the focal length of Polaris and the focal length is wrong, Polaris doesn't shine in the telescope. You can adjust the focal length of a bright star in Ursa major to the brightest in the telescope, and then you must not change the focal length. Search for Polaris with the same focal length, so that Polaris will be bright in the telescope and you can find Polaris. Besides, you can't see Polaris in the southern hemisphere.

I wonder if my answer can help you.