How to make pstext on GMT 6

Hello, everyone.
I have a problem when I used pstext on GMT 6. I don’t know How to make the text on graphics look like files that I attachment. Please help me

Did you look at the text man page?

-G Paint the box underneath the text with specified color [Default is no paint].

I used this script in GMT 6 that I attachement, but failed. Please how is true

I want to make the text on the box and give white colour look like the picture the blue circle that I have attachment

Well, -Gwhite is correct. What is your failure?

After I have compile the output look like that I have attachement