Hello RMALSIN,
You can do it using the AS Menu Options -> Font size parameter.
But our suggestion is to install it using quick-start installation package, after installing the package your site will look exact like our demo preview page and it will be easy for you to make changes in the content, preview all parameters and settings. The quick-start package is actually the template documentation. If by some reason you can't install it on your live server you can install on some demo server or demo folder and then preview all settings.
The package should be installed like regular Joomla installation, here you can find some more info:
http://www.astemplates.com/joomla-template-documentation/152-002041
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You can do it using the AS Menu Options -> Font size parameter.
But our suggestion is to install it using quick-start installation package, after installing the package your site will look exact like our demo preview page and it will be easy for you to make changes in the content, preview all parameters and settings. The quick-start package is actually the template documentation. If by some reason you can't install it on your live server you can install on some demo server or demo folder and then preview all settings.
The package should be installed like regular Joomla installation, here you can find some more info:
http://www.astemplates.com/joomla-template-documentation/152-002041
Regards, AS Team.