This article explains different ways to add a character profile in the LotV version of SC2 Profile
If you are playing ranked, the easiest way to get this done is entering your by player name. This method only works if you have been ranked recently, and if your player name is unique enough. You’ll never be able to find yourself if you have a barcode name for example. The search service is provided by rankedftw.com
The alternative way is to copy & paste your battle.net URL in the search bar. This method should always work, but takes a few more steps to pull off. One way to do it is to log on to battle.net in Safari, then copy the url, and paste it into the app.
If you need help, you can send a mail through the app