How can i install or find turkish alphabet which not found in English alphabet?

Is your computer a Mac, or windows based computer?

For windows based:

http://www.turkishclass.com/turkey/essay/admin/configuration-turkish-keyboard-p1

for macs, hit the help section, and ask about turkish keyboards, and it will guide you through the steps.

You should then be able to switch between normal and turkish by clicking the different flag icons that represent the different letter layouts.

Tq henry