how to change the nat type

You will have to log into your router and adjust the security settings there. If you don't know how to do that just Google your router and it should tell you how to access things.

Are you wired or wireless? Wired through a ethernet cable always gives best open nat in my experience. However in the past when I have been wireless and had nat issues I found that testing the connection in settings resolved the issue. But I would recommend
using ethernet if possible.

Julio, it will depend on your router model you are using and some other network environment information. Are you on wired or wireless?

The best thing I would do is to google "Open NAT on *insert router name and model here*" and see if any guides come up.

If you respond with the model number and brand I can possibly walk you through some things as well.

Hello JulioLuiz1,

Thank you for posting on the Xbox forums. We understand that you are interested in learning how you can change your NAT type from moderate to open. There are several different ways to change your NAT type. You can toggle the UPnP setting in your router
settings, enable DMZ or port forward. The most common solution is toggling UPnP. We will provide instructions on how to complete this process. You can find out how to log in to your router's settings from the router or gateway's manual or support website.
If you received your network hardware from your internet service provider, you can ask them for assistance with logging in to your router's settings. Be sure to let us know the results JulioLuiz1!

Follow these steps to turn UPnP off and on:

1. Log in to your router's web-based configuration page to and make sure UPnP is turned on.
   
   Note Refer to your router's documentation or support website for help turning UPnP on for the first time, or off and then back on. Make sure that the router is restarted each time you update any router settings. If the router doesn’t restart
   automatically, restart it manually.
2. Turn the UPnP setting off, and then save your changes.
3. Restart your computer from a full shutdown and restart all network hardware (your modem and router). Removing the power cords, waiting 10–20 seconds, and plugging the power cords back in is the best way to ensure a full power cycle.
4. Log in to your router's web-based configuration page to and make sure UPnP is turned off.
5. Turn the UPnP setting back on, and then save your changes again. If there’s another setting labeled Zero Config, ensure that this setting is turned on.
6. Restart all network hardware (your modem and router).

Hello JulioLuiz1,

You can try to follow the instructions described in this link to achieve that : https://www.windowscentral.com/how-get-open-nat-xbox-one-enabling-upnp

How to configure it will depend from router to router tho!