Coins and Tokens can be purchased from the in-game Store.  Tap on the coins or tokens icons at the top of the screen to open the store. 

You will receive a daily reward for logging in to the game. Greater rewards are offered on each consecutive day for the first five days.

You may also be awarded tokens for completing puzzles and other objectives.

You can also earn additional tokens by viewing videos or taking advantage of offers in the Tokens section of the Store (these options require an internet connection and may not always be available).