Can I also manually link my credit card settlement transaction to my credit card spending statement?

You can link the transaction through the detail of your expense statement:

1. Go to the menu
2. Choose for "Accounts and cards"
3. Choose for "Your credit card"
4. Select the first expense statement
5. Scroll up to "Your settlement transaction"
6. Click on "Find transaction".

There you can then link the transactions and the card is complete.