Just edit your ~/.bashrc and add this at the very end:

export PS1="realtechtalk.com"

Then your prompt will look like this:
 

bladeblox:uptime
 08:47:14 up 48 min,  1 user,  load average: 1.00, 1.07, 0.96
 

If you wanted a dollar sign at the end then you would change it like this:

export PS1="realtechtalk.com\$:"

You can add other characters into it like spaces or even colon's etc into the PS1 variable above.

\h = show the hostname

\W = show the current path

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