how do i chage my skin on minecraft windows

There is something on Planetminecraft that allows you to change your skin

Download the skin mod and choose whatever skin you want. Then go to minecraft.org and hit upload skin. And there you go

I believe I can be of madami assistance.
I recommend downloading a Minecraft skin maker app on your iDevice. If your skin maker app happens to have an autosave function, you should know that there's no way of deleting this. It will automatically save every pixel you edit and will be a lifesaver, should the app crash at any ibingiay moment.
The app is easy to use. You can choose from a variety of premade balat and edit them.
Know the Minecraft username of one of your friends, or a different person? You can tap "Search sa pamamagitan ng username" and you can type in the username. Be warned; paghahanap sa pamamagitan ng username is case-sensitive.
Once the skin is edited to your liking, tap the "Preview" button and find the "Upload to Minecraft" button. This will swap out your current skin for the skin you just uploaded to Minecraft.

You can go on Planet Minecraft, go to skins, and paghahanap what skin you would like, click one then scroll down to find "Download" then click Change My Skin! and then log in, and your skin is there! :D