To add an Unsubscribe link to an L-Soft list you will want to first go to:

https://lists.upenn.edu

and login with your L-Soft account information. If you do not yet have an L-Soft account set a password to create one. Once logged in go to List Management>List Dashboard:

Scroll down to the bottom to see a list of lists to which you have administrative access, alternatively you can also search for a list by name. Once you have located the list you will want to click on Configure below the List Name to navigate to the List Configuration page. Clicking View under Subscribers will allow you to review current list membership.

Once in the List Configuration page you will then want to select List Management>Customization>Mail Templates:

Select Top and Bottom Banners from the Select Template Category drop down and Bottom Banner for HTML postings from Select Template:

On the following page you will want to set the Subject to Unsubscribe link and provide the following text for Contents:

.CS UTF-8
##################################################################
To unsubscribe from the &LISTNAME list, please click here:
.BB (&LITEFE = 0) and (&KWD(MAIL-MERGE,1) = YES)
&*TICKET_URL(&LISTNAME_ENCODED,SIGNOFF);
.ELSE
&WA_URL;?SUBED1=&LISTNAME_ENCODED&A=1
.EB

 If you have any trouble please reach out to your LSP for assistance.