you are stock with that default windows 10 logo at windows login background.
Microsoft feel too proud of their windows 10 logo that they wont't let you change the login background.
but i'll show easy tricks on how to change the login background image.
This method has proven to be working 100% refer to the images below,but do at your own risk.
you can download the files here
Now let's dive in
After you've downloaded the files
open it up wherever you downloaded it to
1.Find the GUI folder
open it up
Thats our tool for this trick
it runs with administrative rights, make sure you're logged in as administrator,
if not request for administrative rights
3.Then on the right bar where you see edit background
click on the browse icon.
4.now find any picture of yours and press enter to select
you can get some here for free
or you can use the picture in the recommended images folder of your download.
that's not necessary for now.
Just get a picture that will spread all over your screen
5.After that (selecting a picture) click on apply changes
If you choose to go back to the stock login background,
after step 2 click
restore defaults and you will get the stock background already.