Set up problem

I have alawys liked parcel2go so decided to try the plug in for wordpress.
Very frustrating at first because
1. Drop down for country would not work and this I thought was why it would not load after saving.
2. Finally after many goes it allowed the country from a dropdown and still a problem.

Found that by selecting the sandbox option it does not load afterwards. So the question is
1. selecting “sand box” – does this then allow me to test out the plugin?

More information needed about set up – secret* – whatever you write in this box when you get your API must be exactly teh same that you enter under the API code box in you woocommerce set up.
Information needed o the sand box as well.

I also note that the plugin has not been updated for a very long time and woocommerce says npot tested latest version – come on parcel2go you need to do this.