<% MemberMgr.subscribelink %>
macro renders a link to signup-action but only if user is not a member of this site and the site is public

Sourcecode in MemberMgr/macros.js:
1:   function subscribelink_macro(param) {
2:      if (this._parent.online && req.data.memberlevel == null)
3:         Html.link({href: this._parent.href("subscribe")},
4:                   param.text ? param.text : getMessage("MemberMgr.signUp"));
5:      return;
6:   }