When you click the link button, you will see a dialog box with two fields: Search content and Target path. There is also a button labeled “Open File Browser.” From here, you have three choices.

1. Existing page in the current site: use the “Search content” feature. When you type the name of an already-existing page in the “Search content” field, Linkit will find the page for you and automatically insert the correct URL in the “Target path” field. You can even copy and paste URL's into this box, and Drupal will automatically format them into an internal link. (What if the page is not in the list?)
2. File or document: click “Open file browser.” Navigate through the folders to find the file you want, then click “Insert file.” Linkit will automatically insert the URL of the file into the “Target path” box.
3. External site: Copy the URL and paste it into the “Target path” box.
4. Email address: type the email address into the "Target path" field preceded by "mailto:". For example - "mailto:agnr@umd.edu"

In Options 1 and 2, Drupal will automatically fill the Path field with an internal path to the desired page. The URL will probably look unfamiliar (something like "/node/7"). Node is Drupal's term for a piece of content, and the number refers to the ID that the content is stored as in the database. Odd as they may look, when you follow these links, they will take you to a page with a human-readable URL path.