Wordpress Themes - WP Forum at BFA - Custom category page meta tag description

I customized the only category existing at the moment in my sub-domain ( the home page is rediricted to category mentioned).
Checked as usual with a spider similator set to Googlebot result that my category page has no meta description.

How may i add it?
i have to copy the whole source of the file and add the <meta> tag description row
<meta name="description" content="my content's description" />
inside <head> section of the document and load the file via FTP ???

No others way?