I want to create a post using the API. I am following the OAuth 2.0 guide but I am stuck at obtaining the token. I am facing restrictions related to the scope information. When creating an OAuth 2.0 access token, I can select scopes like openid, profile, w_member_social, and email. However, to use the authentication API, I need to use r_liteprofile, but I am having trouble finding where to set this. Please provide a guide on how to use the post creation API.