If I wanted to send a friend an email and attach a publication I have been working on what feature should I use in the Microsoft Publisher application?

In Microsoft Publisher, you can use the "Save As" feature to save your publication in a suitable format for emailing, such as PDF or XPS. Once saved, you can attach the file to your email using your email client. Alternatively, if you want to send it directly, you can use the "Email" feature in Publisher, which allows you to send the publication as an attachment directly from the application.