in Opera, the tag <link rel="apple-touch-icon" href="...."> is displayed in speed dial, but How can I set image in my website to show in speed dial of UC browser ?
Apparently this is not possible. UC browser seems to always use a default picture for Speed dial and Home screen.
I have run the compatibility test of RealFaviconGenerator, which uses almost all known techniques to get a favicon: favicon.ico file, PNG icons, Apple Touch icon, Windows 8 tiles with and without browserconfig.xml... If UC browser was able to accept a favicon, the test should have succeeded but it didn't. Full disclosure: I'm the author of this site.