Local Platform allows you to manage the social profiles, such as Facebook, Instagram and LinkedIn, that are linked to your Google Business Profile.
You can manage these links through the field at the bottom of the location details screen or through the link in the left navigation bar:
If these fields are not visible it is because Google does not permit your GBP to support social profiles.
There are a variety of reasons Google may not permit social links; this is common for businesses located in India.
Unfortunately, this permission is determined by Google, so there is nothing Whitespark can do to change this if it is unavailable for you.