Set Domain Account Password to Never Expire via GUI

Press the Windows logo key + R, type dsa.msc and press Enter to open Active Directory Users and Computers Snap-inExpand your domain and click Users in the left pane, you´ll see a list of domain accounts on your server. Double-click on the user you would like to update.

Stand on a user( administrator). Right button properties

In the Properties dialog, click the Account tab and check Password never expires under the Account options section.

Click Apply and then OK. 

Do this with every user
Now you´ve successfully disabled the annoying expiration of passwords!