Go to your finder in the menu bar you will see the go menu, under that there will be one for iDisk, it will give you three options choose "other users public folder" then type in paulmeyer
edit: Heres Apple's description to do this
To open someone's Public folder:
If you're using Mac OS X version 10.3 or later, choose iDisk from the Go menu, and then choose Other User's Public Folder from the submenu. Type the member name of the person whose Public folder you want to open in the Member Name field, and then click Connect. If a password is required, type it in the Password field and click OK. The person's Public folder opens on your desktop.
If you're using Mac OS X version 10.1 or 10.2, choose Connect To Server from the Finder's Go menu and type
http://idisk.mac.com/membername-Public (where "membername" is the person's .Mac member name). If the Public folder is protected with a password, type "public" in the username field and type the Public folder password in the password field.
If you're using Mac OS 9, choose Chooser from the Apple menu, and then click AppleShare. Click the Server IP Address button, type "idisk.mac.com" in the Server Address field, then click Connect. Type the other user's member name and the user's Public folder password, then click Connect. If the user doesn't have a Public folder password, type "public" in the Password field. Select the user's iDisk and click OK.