How can I enable API in Group Edition?

Hi all,

I have two custom apps that we've build that we want to share with a sister organization but when we go to upload the package we get the error message

"No test methods found in the Apex code included in the package. At least 75% test coverage is required."

I don't know what an apex code test is or how to check its existence.

Can you please help?
Thanks
 

How can I enable API in Group Edition?

Is it possible to create a custom formula to count the number of characters in a Text field?