1. After entering the server, right-click the computer and click Manage to enter the server manager.
2. Click Tools-Select Computer Management in the upper right corner of Server Manager
3. After opening Computer Management-click Local Users and Groups-click Users-right-click and select Administrator-click Set Password
4. After the interface for setting a password for Administrator appears, you can ignore it and just click Continue.
5. When the following dialog box appears, enter the password directly - click OK (note: the password setting should be as complicated as possible, such as a combination of letters + numbers + symbols, too simple a password may fail to set)
The steps to change the password on the 2016 system are similar.