How to exchange collections with credits

Some rooms offer an option to exchange the completed collection with Credits. This option is available only in such rooms: Fast Bingo, Jolly Roger, Christmas Time, Easter, Stars&Stripes, Halloween.
You can complete and exchange your collection set in these rooms up to 3 times. After each exchange, your collection will be reset.
Please note: you won't get your daily bonus increased for completing the collections in these rooms. 
When the collection will be completed, you will see an option to exchange it with credits  in the profile settings (make sure to click on the "Exchange" button