Goto Settings > Theme Options Z. Add new option, fill name and value to it. To use it in Front end use Shortcodes or PHP Code where applicable.
PHP Code can be used in Page Templates or in your Theme directly.
Shortcodes can be used in WordPress environment almost everywhere. Like in Pages, Posts or even in text Widgets.
See above for Support button there you can add Feature request or file a bug report. Else you can goto my personal Blog http://shyammakwana.me/plugins/theme-options-z-wordpress-plugin/ and request and report.
See screenshots above for more details on usage of plugin, Still you find difficulties in using kindly contact me at My Blog shyammakwana.me.