This is very simple and quick! 🙂
STEP 1: Click on the chat icon on the right to open your friends list;
STEP 2: Search for the Kik username you want to add to your friends list;
STEP 3: Click on the username to access the friend’s profile;
STEP 4: Alternatively click on the magnifying glass to search for the Kik username you want to add (if you don’t have it in your contacts);
STEP 5: Type in the Kik username you want to add and click Next to access it’s profile;
FINAL: You can now start chatting! Your friend will automatically be added to your list.