Please follow these steps:
Step 1: From "My wallet" Page, swipe left or right on wallet name section to choose the one you would like to add coin.
Step 2: Tap "Add coins and tokens"
Step 3: In "Stablecoins" tab, tap to the Plus (+) icon to add new stablecoins.
***If there is a pop up that "Please activate ..." => tap "Activate" => enter your password => tap "activate" and these stablecoins are enabled.