In order to connect MyfitnessPal account to your Virgin Pulse app, please navigate the following steps:
Tap on the "Profile"
Then tap on devices and apps
Select MyFitnessPal on the list
A button "connect" will appear. Tap on it.
Once you tap on the Connect button, you will be prompted to enter your MyFitnessPal account credentials :
After entering your credentials, your MyFitnessPal account will be linked to your Virgin Pulse app and it should pull automatically your information.