1- Attach DB from Database Folder
2- open Blog System Folder and open Solution
3- in web.confing at this line
<add name="DefaultConnection" connectionString="Data Source=.;Initial Catalog=BlogSystem;Integrated Security=True">
at Data Source=.;
change . to Your SQL server name
5- Press ctrl+F5 to run application
UserName: admin
Password: itiN@123