Great to hear you like the plugin!
where I change the css code to change the background color of the geolacation, this is the link:
I’m not too sure as to the best approach here, the generated tooltip consists of a number of div elements without either IDs or classes applied to them – so forming a selector is likely to be tricky. Definitely check out Google’s own docs covering markers and tooltips (info windows), though:
And for the login button:
http://i276.photobucket.com/albums/kk14/jimusicec/login_zpsaf8fe504.png
This is a little easier 🙂
The first thing to do is read up on our Themer’s Guide which covers creating your own custom tribe-events.css stylesheet. Basically though you would target this button with a rule like this one:
#tribe-events .login-submit input { background: blue }
Does that help?