Don't think you can do either by using King.com details Facebook ones for that matter, on mobile you're only option is either to connect to Facebook or Kingdom. I think it's only on the King.com site where you can add friends by using their email address.
Wipe the data from the app before you uninstall it, you should be able to do it through the apps menu. When you reinstall and want to connect to FB or Kingdom you'll need to use one you've not used before otherwise it will just load up your progress that's linked to the one you already use.
This kind of problem can come from many sources. After clearing cache, cookies and restarting your browser, is it still freezing when you play Esther? Which browser do you use by the way?
Yeah you can Sapphire, once it's synced to Facebook you can load up your progress on another device that has a different OS simply by connecting it to Facebook.
Normally once you've passed level 20 you should see level available to play across the gap, is it still grayed out for you? The roadblock should be at level 40
Most likely someone who doesn't want to receive more requests like this has flagged them as abusive, this is a FB feature so you need to speak to them if it displeases you, doubt King can do anything about FB policy. Personally that's why I switched to having a Kingdom account, at least everyone on there is there for the…