You just choose Don/€20 membership when you are renewing your membership.
You can do this online:
http://www.48months.ie/membershop?cat=memberships
or by text:
How do I buy stuff by text?
If you have auto renewal of membership set up
Automatic membership renewal
and it's currently configured to buy Standard/€10 membership then you need to change this via your online account:
http://www.48months.ie/my-48/recurring
If you buy a Don membership now it will not start until any current and stacked memberships have run their course first.
Hope this helps.
