In the HTML code itself, look for

<title>Home </title>

and change it to

<title>Company name - home </title>

I'm sure that Page Mason, like most site editors, has some way to set the title to be used.

Regarding the meta tags, you can certainly add your own <meta> tags for keywords, description, and other things. Page Mason may or may not be helpful in doing that (I'm not familiar with it). Be advised that most major search engines pretty much ignore <meta> tags, due to past abuse by page authors trying to artificially inflate their page rankings. If it's a lot of extra effort to add these tags, the results may not justify the effort. You're probably better off putting your effort into writing good content, with lots of descriptive words and phrases in your text, headings, titles, etc.

Someone familiar with Page Mason will have to answer your question. I don't use any page editors myself, and write directly in HTML and PHP for maximum control and flexibility.