Configurate

1º Well, now I´m trying to configure the WordPress, I need to see in the top of the page “the last posts” but as a slideshow

I think it is good use the slide show plugin

For example,
http://ww.wp.xz.cn/plugins/easing-slider/

2º I need to see three post in one line, and other 3 post in the second line, is that possible?? Thank you very much.

Please grid-post.php template customize ,change below

$args = array(
			'posts_per_page'  => 6,
			'numberposts'     => -1,
			'orderby'         => 'post_date',
			'order'           => 'DESC',
			'post_type'       => 'post',
			'meta_key'        => '_thumbnail_id', //Shows only has post thumbnail
			'post_status'     => 'publish',
			'post__not_in'    => get_option( 'sticky_posts' ),
			'raindrops_tile_col' => 3,//columns 2-4
			);
	raindrops_tile( $args );

Thank you.

Sorry

please try below

$args = array(
			'posts_per_page'  => 8,
			'numberposts'     => -1,
			'orderby'         => 'post_date',
			'order'           => 'DESC',
			'post_type'       => 'post',
			'post_status'     => 'publish',
			'post__not_in'    => get_option( 'sticky_posts' ),
			'raindrops_tile_col' => 4,//columns 2-4
			);
	raindrops_tile( $args );

Thank you.

I create a example page

using

https://gist.github.com/tenman/7980444

and featured post image.

http://www.tenman.info/wp3/previewraindrops/grid-post/

Why you not use template?

Thank you.

When you upload an image, how do you do it?

Post create page( post-new.php ) has Featured Image MetaBox

‘Set featured image’ link Click and select image or upload.

Very Easy.

Thank you.

can I give you administrator access to my blog to look what I´m doing wrong?

Sorry, It is not possible for you, and do to support personal

Please review the steps

1. Create a New page
title:Top Page
Page Attribute Meta Box
Template
value select Grid Post
Submit

2. Dashboard / Settings / Reading
Front page displays
Radio button A static page (select below) check
Select box Front page: value Top Page select
Save change button click

If done correctly this setting, the template will be applied to the top page.

3. Create a new post
title: your tile
content: your content
Featured Image MetaBox
‘Set featured image’ link Click and select image or upload.

Thank you.