Put the file in C:\Program Files\Microsoft SQL Server\MSSQL16.MSSQLSERVER\MSSQL\Backup
To install start SSMS → object explorer → Databases → right click → “Restore Database…” → Device → … → Backup media type: → choose “File” → Add → Choose the .bak file → OK → OK → OK
For other users to access it
SSMS → Object explorer → Security → Logins → DESKTOP-CRLPVE5\<username> → double click → Server Roles → check “sysadmin”