Want install phpmyadmin

Hello,

i want install phpmyadmin. I needed php-mbstring, but yum didn find nothing. Google said me i need to install the Optional Repository. But i didn't find this optin my account.

I have REHL Server 6.5 self subscriptions Licenc.

Want can i do, to install phpmyadmin?

kind regatds
Ulrich Schönberg