You need to go to your club's website and find their login link, probably called something like Member's Area or Member Login.
If you don't know your club's internet address, then a search using Google or similar will be the best way to find it. To limit the results specify the country in the Google search e.g. myclubname site:nz.
If you still can't find it then send an email to firstname.lastname@example.org explaining what you're looking for, and we'll help you find it.
"...would be lost without it..."