How to hide a specific h3 title in blogger sidebar while leaving other h3’s in sidebar showing

I’m using a blogger template and I want to hide a specific h3 heading. However it’s one of a few h3’s used on this page. Both of these are in the sidebar. The one I’m trying to remove is

<div class="widget Image" data-version="2" id="Image1">
<h3 class="title">
Donation
</h3>
<div class="widget-content">

I want to show the element, which in this case is an image, but it has the title Donation directly above the image. It is this title that I don’t want shown.

Donation title with Donation image

This is, for now, the other title on the page I’d like to keep.

<div class="widget BlogArchive" data-version="2" id="BlogArchive1">
<details class="collapsible extendable">
<summary>
<div class="collapsible-title">
<h3 class="title">
Archived Blogs
</h3

I have access to the template source code so I have the ability to change certain things but would need some guidance as to where to put things as I’m very new to code, more the follow instructions type.

I would give the website URL so you could view but I’m in the process of setting up a new URL and it’s still crossing over at the mo.

I’ve already tried setting it to show: none; won’t work. Any ideas? I believe I have already tried ‘nth-of-type’ but may have put it in the wrong place?