If you need to set/change home page on your site, go to Customize > 'Homepage Settings' tab. There are two options:

Once you have activated 'A static page' option you can see another dropdown list called 'Posts page'. This option is required to enable posts page in default Wordpress themes. In Seosight it is not required. So you can leave this field empty.
Once you are ready, hit the 'Save & Publish' button.