insert e.g., in front of citation

I want to insert e.g., in front of citation.

What I have:

Blalalalala (1-8).

What I want:

Blalalalala (e.g., 1-8).

I have found the option for a prefix, but what I get is:

Blalalalala (e.g., 1, 2-8).

Quote:  Blalalalala (1-8).

Could you explain your example further and identify the style you’re using?  Is the 1-8 appearing in the parentheses something you put in manually (via Edit Citation) or corresponds to info appearing in the corresponding reference? 

Normally once you’ve inserted the in-text citation then edited it to remove both author and year, then typed in e.g., 1-8, followed by manually typing the author’s name preceding the “(e.g., 1-8)” which would now appear in the text  you’d wind up with:   Author (e.g., 1-8)

So could you describe further?