- Change the format to comments - i don't want the heart.

To remove the heart from behind comments in the Lovebirds theme, add this to your Appearance → Custom Design → CSS editor:

.comments-link a {
	color: black;
}
.comments-link::before, .comments-link::after {
	display: none;
}

- Take of the green flower below the logo

To hide the vines below the logo on the left, add this to your Appearance → Custom Design → CSS editor:

.vines {
	display: none;
}

- Take of the bar "início" or "beginning"

That is the main menu. You can hide it using CSS such as:

nav {
	display: none;
}

- Change the type, size and colour of widget's title

Here is an example you can start with:

h1.widget-title {
	font-size: 3em !important;
	font-family: Helvetica, Arial, sans-serif !important;
	color: red;
}

Adjust the different values as necessary.

To learn more about font stacks:
http://unitinteractive.com/blog/2008/06/26/better-css-font-stacks/

To pick a color code:
http://automattic.github.com/Iris/

- Change the type, size and colour of widget's title
- Take of the bar "início" or "beginning"
- Take of the green flower below the logo
- Change the format to comments - i don't want the heart.

Thanks