Creating custom link

Hi, This is a great plugin!
I’m trying to create a custom link where I have an image, and I want to add an “a href” link on it that has the same add to favorites function given in the plugin.

I see that the link on the live page is :yoursite.com/?wpfpaction=add&postid=155

But I can’t just copy that because that is going to a specific post (id 155)
I want to put an action on my link that tells it to get the specific post id of the item

So I am thinking my custom button link would need to look something like:
<img src=”images/buttons/save.png”>

or

<img src=”https://www.thefashioncorporation.com/new/images/buttons/save.png”&gt;

Any ideas?

https://www.ads-software.com/extend/plugins/wp-favorite-posts/