Hey there folks,
Thanks for posting about this here in the Community!
On the desktop app, you can find Your Daily Mixes in Your Library under Made for You.
For more info about Daily Mixes, we'd recommend taking a look at this support site article.
Keep in mind that if you're new to Spotify, it might take a bit before you see your Daily Mixes. There's more information about this at this Spotify Answer.
If you're having troubles seeing them on the desktop app, you can also check this Spotify Answer for some troubleshooting steps you can try.
Hope this helps! Don't hesitate to give us a shout if you'd like more help.
Have a lovely day :)