I want to create a post on one of my social profiles, but there's nothing on my Publish dashboard.
If you have your social account added in Account Preferences, and you're not seeing them on Publish dashboard, it could be that you are a sub-user of this account that you're working on.
You need to ask the main account holder or a user with an Admin role to go to Manage Users > Find your username > Edit and, add those social accounts under Permitted Accounts.