How to make thumbnail preview a link to the post?

I think pagination should be out of the [posts] block, like this

[posts]
<div class="postItem">
[post_thumbnail width="323" height="533"]
<h4>[title]</h4>
</div>
[/posts]
[nav type="plain" ajax="1" prev_text="Previous" next_text="Next"]

To link post thumbnail, add an anchor around it –
<a href="[post_permalink]">[post_thumbnail width="323" height="533"]</a>

For post thumbnail size, try using a size name instead –
[post_thumbnail size='post-thumbnail'] or [post_thumbnail size='thumbnail']

THANK YOU. THAT WORKED PERFECTLY!! ??

Hello, I am quite new to wordpress and no coder at all, but I am trying to build a web site and pages that post a list of posts as thumbnails. As I already used this plugin for simpler lists i tried to take the code from jiinlaw and tried to adapt to my needs.
I have a list of posts by just one category and it all kinda worked except for 2 problems
1) thumbnails don’t tile properly in the page
2) the nav shortcode results in a misplacement of the navigation elements

Note that 1) happens irrespective of nav being in the code or not being there

my page is: https://genmic.unipv.it/linee-di-ricerca-wp-list/

and the plugin code for the list is

[posts]
<div class=”postItem”>
[post_thumbnail size=’thumbnail’]
<h6>[title]</h6>
</div>
[/posts]
[nav type=”plain” ajax=”1″ prev_text=”Precedente” next_text=”Successivo”]

The CSS Style bit is

#w4pl-list-[listid] .postItem{
float: left;
margin:0 1% 30px;
}
@media screen and ( min-width: 480px ) {
#w4pl-list-[listid] .postItem{width:30%;}
}
@media screen and ( max-width: 480px ) {
#w4pl-list-[listid] .postItem{width:98%;}
}
#w4pl-list-[listid] .postItem img {
float: left;
margin: 0 0px 15px;
}

I tried for quite a long time but cant fix it.

Any help is appreciated ;-P

thanks