UDesign provides live ajax search on search box.

If you want enable live search, go to Theme options > Features > Search.

Use Relevanssi for Live Search

UDesign is compatible with Relevanssi.

Relevanssi replaces the standard WordPress search with a better search engine, with lots of features and configurable options. You’ll get better results, better presentation of results – your users will thank you.

Use Relevanssi for Live Search is enabled in Theme options > Features > Search.