Hi Jual and welcome to you,
As you seem to have worked out for yourself, you need to know what things are safe for you to eat and what you should avoid. Your first and best plan of action is to find out as much as you can about carbohydrates and their effect on blood sugar. You will find a huge amount of information in this forum in the section called "Diabetes Discussions", under the topic "Sticky - General Links for Diabetes".
The sugar levels shown by your meter are very high - around double what they should be in a pre-prandial (i.e. before eating) test. By understanding the effects that different types of carbohydrates and sugars have, and a good bit of trial and error on your part, you will work out what is good for you and what you need to avoid. This tends to differ from person to person, so what works for me won't necessarily work for you.
To answer your specific question - a mango has the same carbohydrate value as an apple or an orange. Mangos won't do you any harm - in moderation. But I'm afraid that liquorice is an absolute no-no for a diabetic. It severely reduces glucose tolerance so is one of the worst things a diabetic can eat.