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.