- Go into apps (the four squares, top right of the home screen)
- Open the "Scroll Apps" application
- Open the menu (which is the 3 vertical dots.. fourth icon along from the bottom left of the screen)
- Choose "Setting" (spanner icon)
- Under "Share" choose "More Applications"
- You will get a pop up with "Complete action using", choose Play Store
- This will start the Play Store app where you can sign into your account, download apps etc.
Once you've done this, the Play Store app should now be showing on your applications list, so you shouldn't need to go through this again.
I haven't played around much, but I suspect that the number of apps available on the store will be restricted.