It really depends on the program itself. For some we can import all flights, but with others only upcoming flights.
NOTE: Importing occurs during the first login, and each week thereafter. If the system updates with added flights from your loyalty profile during the first week, to be thorough, we will check your connected loyalty accounts for new flights more frequently.
Just swipe the program name left and tap on Sync button
Tap on the program name and select "Sync Now"
You should see status "Pending". In time the balance will be updated, and we will import flights according the supported airline program.