There are two types of links in web sites: absolute links and relative links.
The absolute link for a site is the entire URL that you see in the web address bar at the top of a browser window. It includes the domain of a site (e.g. artsci.wustl.edu). Use absolute links when linking to pages outside of the site in which you are working. (You can copy the link directly from the web address bar.)
A relative link is relative to the current page you are on. If you are already within a Drupal site and need to link to another page within that same site, you only need to include the portion of the URL that is different. E.g. a relative link to http://artsci.wustl.edu/about would be '/about'. Links to files or pages within the same site should always start with a slash '/'.
To insert a link, highlight the text that you wish to link and click the "link" button above the text area in which you are working. A pop-up will open like the one below. Paste your relative or absolute link into the URL box and click OK.
To edit an existing link, select the link and click the same button.
Link type will generally be URL, but if you have added anchors to your page, you can also link to those. Just change link type to 'Link to anchor in the text' and select your named anchor from the 'by anchor name' dropdown.
You can also add a 'mailto' link for e-mail addresses that will open up an e-mail client if a visitor clicks the link and one is configured. To do this, select 'E-mail' from the link type dropdown and and paste the e-mail address into the e-mail address field.
To remove a link, select the link you wish to remove, and click the "broken link" button (grayed out unless a link is selected) above the text area in which you are working.
In Drupal 7, uploading a file and linking to it can be done in one simple step. Allowed file types are: txt pdf doc xls ppt odt ods odp docx xlsx and pptx. Files are also automatically renamed on upload to be web-friendly - removing all spaces and special characters.
To add a link to a file, highlight the text that you wish to use as the link, and click the "link" button.
The same popup window from above will appear. Since you want to link to a file, you need upload the file to the server or find it if it was uploaded previously. Click on the 'Browse Server' button. This will bring up another dialog window like the one below:
This displays the files that you have previously uploaded into your site. (You can also reach this dialog by going to your account and clicking 'file browser'.) If you are linking to a file that you've uploaded before, you'll need to scroll and find it. (This is why good file names are so important!) Select the file from the list, and click 'Insert file'.
To upload a new file, click the 'Upload' button in the top left corner, click browse to find the file on your local computer, and click the upload button beneath the file browser. (You may only upload files into the IMCE folder so make sure it is selected.) After uploading a file, the new file should be selected automatically. Click 'Insert file'.
To replace a file and keep the same file name, find the existing file, select it, and delete it. Then upload the new version with the same name. (Make sure to double-check the name in the file list since Drupal automatically renames uploaded file to be web-friendly.)
If you will be using a file as a menu item, do not upload the file using IMCE. Instead, create a new managed file.