Unwanted Advertizements

How does one stop the ads running at the top of my forum header. They haven't been there always. I would like to get rid of them.

Thanks.
Clif Davis
F1 Classic

ACP > General > Configuration > Activate ads: Guest

If you want to remove ads altogether, you will need to purchase credits

Sorry, how do I do that and how much are they?
Thanks for your reply.
Clif

Registered Users:
You can choose below the additional time during which ads will be disabled for your members

Add 1 month(s) : 100 Credits
Add 2 month(s) : 200 Credits
Add 3 month(s) : 300 Credits
Add 6 month(s) : 500 Credits
Add 12 month(s) : 1000 Credits

Members and guests
You can choose below, the additional time during which ads will be disabled for your members and your guests.

Add 1 month(s) : 200 Credits
Add 2 month(s) : 400 Credits
Add 3 month(s) : 600 Credits
Add 6 month(s) : 1000 Credits
Add 12 month(s) : 2000 Credits