Your /etc/freenet6/tspc.conf should look like this
tsp_version=1.0.0
auth_method=any client_v4=auto
userid=<YOUR USERNAME HERE> passwd=<YOUR PASSWORD HERE> host_type=router prefixlen=48 if_prefix=<YOUR INTERNAL INTERFACE HERE>
template=setup
server=tsps1.freenet6.net
if_tunnel=wan1
2 pages link to tspc.conf: