If you would like a true Single Sign On (SSO) implementation you will be able to set this up using the attached documentation.
If you are simply looking for a link to use to allow your clients access to the portal, you will want to go to the Portal Branding screen (Wolters Kluwer logo-> Administrative Tasks-> Portal/Workflow-> Portal Branding). At the top of this screen there will be a link labeled "Portal Link." You may copy the link from here and place it on your site.