Was it working before?
What does your My 48 account page say about your membership status, expiry date and allowance balances?
Did you buy a new membership recently and it hasn't kicked in?
Several people are reporting this problem with new memberships recently - they buy them but they never appear on their account or don't work.
In that case you need to contact 48 support - see the link in my signature below.
Hope this helps.