I messed up with the location of the pokestop and i didnt put the it in the right place how can i change it?
What is the status of the nomination? Is it in queue, in voting, or decided?
It decided and accepted
Okay, if you mean that the wayspot is not in the correct location for the real world, then you can use help chat to request they move it.
Go to https://wayfarer.scopely.com/new/help and a chat box will pop up on the right. A bot will take some information and a human will get back to you later with a reply in the box.
They may need evidence if the correct location is not obvious on the map.
If you just mean that you did not put it in a location where it was eligible to become a Pokestop, but the physical location is correct, Wayfarer staff consider moving a Wayspot for game manipulation to be abuse. Unless you can show that the current location does not correctly represent the point of interest in the real world, then do not try to do a location edit just to get a Pokestop.