Hello,
It is not actually necessary to remove the title, you can simply hide it. The point is that this option is not quite obvious for users, so we decided to modify it a little. Hopefully, we'll do it this week. Once we are done, we will update you.
As for the Add testimonial button, you can modify its look&feel in the css files of the component template used on your website, e.g. components\com_testimonials\templates\default\css\style.css. See extract
a.tm_add_button {padding:5px 30px 6px 15px; font-family:Arial; background:url(../images/add_bg.gif) no-repeat right; font-size:12px; font-weight:bold !important; color:#FFF !important; }.
If you want to change the words, please find file en-GB.com_testimonials.ini in the _SITE_ROOT\language\en-GB\ folder and modify it. Remember to save the changes.
I want to remove that heading too, I want to put something different there. I am struggling to find the ouput code for it, I am using Joomla 2.5, and Testimonial 1.6.3. I just want to know where the files with the codes are.