In any email program there will be an Attach function. You just need to be able to find it. Attach often uses the Paperclip as it's Icon and is most often located towards the top of your email; near the subject line.

Create your email and press the Attach button. You will need to be able to “Browse” to the location of your document or picture in order to select it. So make sure you know where your file is.

Once your file is selected; press OK, etc… till you get back to your original email.
You should see the the file near the subject line. Note: some programs do put the attachment at the bottom of the page too. Just look around till you find what you need.

Web based email, such as Gmail, Yahoo, Hotmail, and AOL you can see the “Attach a file” option below with the paperclip icon.

Select Attach a file and you will prompted for the location of the file.

This is where you browse to the location of your file. Files are usually in My Documents and pictures are usually in My Pictures. It is a good idea to practice finding your documents and photos so that you know where they are.

Select the file you want
Press Open, OK, or Select (depending on the program) and the file is attached to your email.

Outlook: Uses the Paperclip symbol

Windows Live Mail: Uses Attach