My customers are receiving errors when submitting their forms

Can you please look at my Holiday Boutique application - I've received several complaints that people can't complete the form due to various errors. 

Hello,

I did a test submission in your form and got the following error.

Please check your authorize.net credentials and let us know if the issue persists.

Thanks.

How do I check my credentials???? What do you mean??

Amber Wilson
Executive Director
Nipomo Chamber of Commerce
239 W. Tefft St.
Nipomo, CA 93444
Tele: 805-929-1583
Fax: 805-929-5835
info@nipomochamber.org
www.nipomochamber.org

join-our-email-list-300x103

...

You have an Authorize.net payment tool in your form.

But it's not configured.

You need to either remove this tool or configure it (in order to accept payments).
This is the reason why your form is showing that error message.

Please let us know if you have further questions.

Thanks.