If you can remember the email address that you currently have registered with the club, then it's a straightforward matter to get a reminder of your username and / or password. If you've not changed it online since, your registered email address will be the one that you entered when you registered online, or else that you wrote on your membership form.
First click sign in in in the top-right corner, then click forgot login (also under the login button on the left).
Then fill in the details requested. The reminder will get sent by email immediately.
If you can't remember your registered email address, contact the web admin and they'll send the username/password reminder to the email address that we have on record.
Once you have retrieved your username / password you should change it to something more memorable so that you don't have the problem again!