installing memory on my iMac 27

To post the Etrecheck report...

Pastebin is a good place to paste the whole report if you capture the URL while there…

https://pastebin.com/

Whew, they've changed pastebin & made it harder, but after pasting in, click Create new paste button, then Embed button, then copy the URL...

<script src="https://pastebin.com/embed_js/KuvnghqA"></script>

The important part of the above is...

https://pastebin.com/embed_js/KuvnghqA

Workable but harder for me to work with...the Note tool on the bottom of this editor's toolbar, as shown in the image, to copy and paste the output from EtreCheck. In a Reply before you click post, look for this to add longer texts...

RAM...

Memory Upgrades for Apple iMac 2009 - Up to 32GB (macsales.com)

OWC SSD Upgrade Kits for 27-Inch iMac 2009 (macsales.com)

How to Upgrade the iMac 27-inch (Late 2009) (macsales.com)

Would need to know the year of iMac. :)