Home Phone Order - I want Line Rental Saver & Caller Display too !

[#1]

Just went into the Member Centre to add Home Phone (finally got round to moving from BT) to my Fibre Unlimited product I have had since 2012. I wasn't given the option to pay for Line Rental Saver and to request Caller Display for 99p. How do I do this or do I have to wait a while until the phone parts of the member centre are accessible to me ?

[#2]

I move my landline to plusnet and it was activated this morning. I hadn't really thought about caller display but realised how essential it really is after the first call of the day.
It's simple to add in the member centre and, although some of the wording indicates that features might be added overnight, my caller display was added within the hour (might have been a lot faster).
[ I was offered and took up the offer of Line Rental Saver - although it wasn't the biggest saving ever, so I cannot answer how to do this after sign-up. ]

[#3]

Hi there,
Caller display can be added here http://www.plus.net/support/phone/call_features.shtml
and line rental saver here http://www.plus.net/support/phone/call_features.shtml