To disconnect or remove social profiles, go to Settings > Social Networks.
Then follow the instructions below.
Removing social profiles
You can remove or disconnect your social profiles from Post Planner at anytime. Just follow the instructions below:
Go to your Facebook settings here and remove the Post Planner app
Then logout and login again to Post Planner
Your previously connected Facebook account will be gone
Then you can connect a different FB account, if you so desire
Go to LinkedIn Permitted Services and remove the Post Planner app
Then logout and login again to Post Planner
Your previously connected LinkedIn account will be gone
Then you can connect another (or the same) LinkedIn account, if you so desire
Instagram, Pinterest, Twitter
Disconnect any profile by clicking the remove "X" that appears when you hover over the profile

You can then connect any profile from these networks by following the instructions above
You're all set!
Here are some helpful links for related actions:
CONNECT: How to connect your social profiles