Keys are small files that you distribute to people doing content editing. When the user opens the key (as long as they have Contribute installed on their computer), Contribute will automatically be configured to access a site. Though Contribute includes an option to generate and email keys in one step, we have found that it generally doesn't work with Lehigh email. So you will need to first generate the key and then email it to the users who need it.
To generate keys go to the Edit menu and choose "Administer Websites". Then choose the site you want to generate keys for.

Click Send Connection Key.

Leave Yes clicked.
If you need to send the departmental password, click the Check box for "Include my SFTP login and password."
Click Next.

Select the user group you want to generate a key for.
Click Next.

Click the "Save to Local Machine" radio button. Enter a password to encrypt the connection key in the two text fields. Click Next.

On the page that shows the settings, click Done.

Choose the folder to save in, and if necessary, change the file name for the key. All key file names end in .stc
Click Save. Click OK to get out of the Administrator mode. Click OK on the popup window.
What if you want one set of users to only be able to access a particular directory? Or to have different editing rights on the pages than other users? You will need to set up a special user group for them, then change the group settings, and create a key.
Go to the Edit menu, and choose "Administer Websites", then choose the site you want to generate keys for. Click the New button in the Permission Groups area.

Type in a name for the new group. Click OK.

In the Permission Groups area, select the new group you've created, and click Edit Group.

Enter a group description and change the homepage if you need to.

To determine what subdirectories the users can edit, click on Folder/File Access on the left side.

Click the radio button for "Only allow editing within these folders", then "Add Folder"

Use the Choose Folder dialog to find and Open the folder you want to select, then click the Select "..." button. Repeat for any other subfolders. If you want to allow users to delete pages, click the check box for that. To restrict what parts of the pages they can edit, click on the Edit button on the left.

Change whatever settings here you find useful. I chose using standard Paragraphs, not allowing multiple consecutive spaces, and enforcing accessibility options. Clicking Styles and Font on the left allows you to set more settings.

Clicking New Pages on the left gives you the options to allow users to create new pages, with or without the template:

Using the settings on the New Pages, you can allow users to create blank pages, only create pages using built-in samples, only create pages based on pages currently on the site (all pages or only specific ones), and/or use Dreamweaver templates stored on the site to create pages.
The New Images section allows you to prevent users from adding new images, or restrict them to adding only new images below a certain size:
Once you have set all the permissions as you want them to be, then you should generate the keys for that user group.
You can attach the .stc file to an email message, or have the user copy it from your public space or departmental space on the LAN.