You can view all you connected exchange account balances on tuned by clicking on the diamond sign, just below the tuned logo.
As soon as you click on it, you'll see two things. On the left is your portfolio equity curve and on the right, is a breakdown of your connected exchange by asset. Portfolios will vary, but you should see something like the image below.
If you have connected more than one exchange to Tuned, there will be a dropdown next to the diamond icon. This allows you to specify which portfolio you want to look at.
There is also a small refresh button at the bottom of this box, which helps you to get your most recent balance. Just click on that refresh button and the balance gets refreshed.