Hi.
The "My Site" is the default name for your site's title.

Go to the dashboard and Settings on the left and Site Name should shown in the top left corner. Change it to what you want.
Perhaps, Rebuild Your Heart

Did this work for you?
I noticed you switched themes.

Also, I noticed that you have a lot of formatting code in your text areas due to microsoft word.
When you are pasting text into the text block, use the 'paste from word' icon in the tinymce editor window. Or, you can paste it into notepad and then copy and paste to the text block. It will save a lot of space and make the formatting easier to control.

Worked great. And thanks for the hint on Word. Was concerning me but it (code) disappeared so I thought a tech issue I did not need to deal with.
My first "real" website creation.
Getting accustomed to the software
I have used Yahoo for my Biz http://www.orlandeaux.com and it is quite easy. Not as expanding tho.
Enjoy the day. Best Greg

depending on the site theme this may not always work.. the link here should help everyone:
http://www.concrete5.org/help/faq/how_do_i_get_rid_of_my_sitename_/...

Hi. I've done all you said, but now I have another problem: I want to remove my logo from the home page so I can have a bigger image there and and the image is not twice. Thanks.

This link should help you change the "Site Name" field at the top of
your layout:
http://www.concrete5.org/help/faq/how_do_i_get_rid_of_my_sitename_/...

I use watermarking tool, why not google for some one. These tool are generally capable of adding watermark as well as removing.Maybe try
http://www.rasteredge.com/how-to/csharp-imaging/create-watermark/...