Your Landing Page is the first page in Talemetry you see when you login. If you keep going to the same application first, you may want to change this to save time.
At the top left of the Talemetry UI, you will see your user portrait and user name.
Beside your user name is a small down arrow. If you select it, you'll see user information including an option for Settings; select Settings.
Among your Settings, at the bottom right, you'll see "Landing Page", change that to what you wish.
"Default" is the default landing page defined by your administrator. You can also choose from any of your available applications or the Dashboard.
Then click "Save" at the bottom right.
That's it, you're done! The next time you login, you'll land on the option you selected.