How can i change place in orbit

[Remyyy]

how can i make that my two Rockets are on the same place? (in orbit)

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point (green) (blue)

[Snark]

Hello, and welcome to the forums! 

1 hour ago, Remyyy said:

how can i make that my two Rockets are on the same place? (in orbit)

Here's your screenshot:

Note:  it's easy to get pictures to show up right in your post.  Instead of pasting the link to the page where you put your screenshot... paste the link to the image itself.  (You can get this by right-clicking on the image and selecting "Copy Image Location".)  Doing that and pasting the image link will cause it to get automagically included as an in-line image, as shown here.

Anyway, on to your actual question:

If two ships are in the exact same orbit but different locations along it, they'll just stay that way forever (same relative positions).  So, to make one of them get over to where the other one is, you need to make them have different orbital times, i.e. so that one of them takes more time than the other to complete an orbit.  Then the faster one will gradually "catch up" to the slower one.

So, in this case, the green ship is a bit "ahead" of the blue ship, so you'd want to either slow the green ship down, or speed the blue ship up.

You can slow down the green ship by burning a bit to raise its Ap some.  Alternatively, you can speed up the blue ship by burning to lower its Pe.  However, you'll be limited in terms of how much you can do that, since you don't want to lower its Pe below 70 km (since then you'd be hitting atmosphere).

[Superfluous J]

If you set the other ship as a target, you should get encounter markers. One will tell where YOUR ship will be, the other will tell you where the OTHER ship will be.

Place a maneuver node just after the marker that says where your ship will be, and drag it prograde. The marker telling you where the other ship will be will move. Set up that maneuver so that the two markers are very close.

Do that burn, and then you'll have a close encounter. When you get to that close encounter, set your navball to "target" mode, and burn retrograde until you're going 0 m/s. You should be fairly close to and moving in the same direction as your target vessel.