You can place images in your Dreamweaver pages. Have your images ready first.
This page has a background image - see below.
It is important that your images are not too large otherwise they will take too long to load on the page and your site visitor will not wait. See the page on Optimising images
Have your images ready in a folder within your site. They should be optimised to the size you want them on the page. You should not just insert them and reduce the size by dragging.
If you are not sure of the size you want then prepare an image the approximate size, insert it and drag it to the size you want. When you are sure of the final size you can note it from the Properties Inspector Bar and make a new optimised image the correct size and insert that in the correct place.
To insert an image
You can drag it from the folder on to the page,
OR use the Insert menu: Insert > image
From the dialogue box choose the location of the image and then the image, > OK
Next you will get a box called Image Tag Accessibility Attributes
Alt (or alternative) text is what appears in place of the image for text-only browsers. For visually impaired users who have speech synthesizers the text is spoken out loud.
Long description is also useful for accessibility so should be completed.
When the image is inserted you can highlight it to see its properties on the Properties Inspector Bar. These can be changed - eg whether you want a border, the border colour, etc.
V Space and H Space are the vertical and horizontal spaces around the image.
You can also put an image into a div tag which is formatted using CSS rules.
Insert an image as a background
Prepare an image of the correct size and transparency/colour and save it in your images folder.
Using New CSS Rule choose Background from the list on the left of the dialogue box and then in the Background box insert your image using the browse button to select it. Choose no repeat in the repeat box if you want.
Note: you can also add a plain coloured background using the same method.