The article presenting webframe ITBrix.Blog.ViewPost has a specific setting to set the title of the post it is presenting in the page context as a data variable. (eg. $_post-title ). Once set the value (the post title) is available to all other webframes and the platform via its data variable key (eg. $_page-title ).
Now when it is available you will need to navigate to your page management screen -> meta tags tab and find a way to get and present it as the page's meta title. To get a data variable value with a functional tag and present it you need to use the "content" functional tag (eg. {{content: data-variable $|$ $_post_title}} )
This functional tag will be replaced by the system with the current value of the $_post-title data variable.