First I uploaded the image module to allow me to upload images. Then I uploaded the image assist module to allow me to add an image to a blog post.

Now, it is time to add images to galleries. This wasn't too hard, as I already had the modules I needed installed. I just went into
Home » Administer » Content management » Image galleries and added two galeries. I added "Drupal Photos" and then "Cat Photos". I added the cat photos gallery because I wanted to see what using two photo galleries was like and I have so darn many cat photos on my hard drive.

Once you have a gallery added it is easy to add an image to that gallery when you upload an image just by selecting that gallery on the add image screen. You can also go into the page for any existing image, choose edit, and add it to a gallery there. I don't see how you can add one image to multiple galleries, so maybe you can't.

I'm pretty sure that if you use Image Assist to upload a photo it can not then be added to a gallery, because the image itself is only supporting content for a node, an dnot content itself.

To get Image Galleries to show up in my side menu I had to go into "Edit primary links", and "enable" Image galleries. I got a few options for how the Image Gallery would show in menus, including setting the title, description, if it should be expanded, parent item, and weight. I just took the defaults, except checking Expanded which "If selected and this menu item has children, the menu will always appear expanded". That sounds fun, doesn't it!