If your edit post goes to HomePage then problem is this your server have messed up code. Please follow up these steps.
1- Download latest theme file from themeforest.net
2- Extract this zip file. then you will see classiera.zip
3- Then extract classiera.zip file and you will see one folder by name of classiera . Open this folder and you will see one file by name of template-edit-post.php
Method One
1- Login with your FTP or Cpanel.
2- Come to root/wp-content/themes/classiera/
3- from here delete old file by name of template-edit-post.php
4- After to delete this file please upload new file.
Method Two:
1- Login to WordPress Admin.
2- Come to WordPress Dashboard --> Appearance --> Theme Editor --> From here select file template-edit-post.php from right side.
3- Select All code and delete all code.
4- Then copy code from your computer file which you have download and paste code in wordpress.
Save changes.
For second method you can also watch this video.