For converting Microsoft account to local account in windows 10 you need to go to settings first. Follow this instruction:-
- First, go to 'Settings'.
- Then click on 'Accounts'.
- After that click on 'Sign in with a local account instead'.
- Then you need to put your Microsoft account password and then click 'Next'.
- Then a window will appear where you have to choose which local account you want to convert. If you do not have set any account before then you need to create a new one. You could set a password but if you don't want, then leave it blank. Then click on 'Next'.
- After that click on 'sign out and finish'. That's it.
Watch this video where you will find how to convert Microsoft account to local account.