Sure, I can help you with that! Microsoft Excel has a variety of templates available, including templates for PTA treasurer's reports. Here's how you can find and download a template:

1. Open Microsoft Excel on your computer.
2. Click on "File" in the top left corner of the screen.
3. Select "New" from the dropdown menu.
4. In the search bar, type "PTA treasurer's report" and hit enter.
5. You should see a variety of templates available. Click on the one that best fits your needs.
6. Once you've selected a template, click on "Create" to download and open it in Excel.
7. The template should be easy to understand and use. Simply fill in the necessary information and save the file when you're done.

If you don't see a template that meets your needs, you can also try searching for other financial report templates or creating your own custom template.