How to add tis-620 to pma?

[nmaster]

Hello, this is my first topic on this forum.

I try to log in using tis-620 but can not found tis-620 on drop-down menu.
I try to fix by download phpmyadmin-2.11.4-all-languages instead the old pma and log in using tis-620 again but can't fix these problem, the MySQL charset still is UTF-8 Unicode (utf8).

How to add tis-620 for thai language to pma?

sorry for bad english.