How to use wordpress for my 2nd site too?

Hello,

I have 2 sites – speak-visual.com and graphicwhispers.com.

When I go to WordPress wp-admin I automatically get to speak-visual.com. This is fine as it’s my main site.

Is there an option to work with graphicwhispers.com in WordPress too?

For example I have a client and when I login to their site iconcipio.iconcipio.com I am in WordPress for that site and can make changes to it…..

Why can’t I do it with graphicwhispers.com?

I have a student and would like to explain basic wordpress and css (what I know so far myself ?? ) using the graphicwhispers.com site, so need to login to it through wordpress.

Thank you!

Eli