In order to include Magento 2 Blog link in the top navigation menu, go to the Stores > Configuration > Magefan Extensions > Blog and find Category Top Navigation group.

Magento 2 Category Top Navigation

Category Top Navigation

1. In the Display Blog Link select box choose whether to display a blog link or not.

2. In the Link Text indicate the text of the link which will be displayed on the Storefront.

3. Select whether to include blog categories or not in the Include Blog Categories field.

4. Enter the maximal amount of subcategories layers to be shown in the category top navigation in the Maximal Depth field.

Magento 2 Category Top Navigation

Once all the changes are performed do not forget to press the 'Save Config' button.

Magento 2 Category Top Navigation