Hmm. It seems like you don't have enough samples, and it also looks like you didn't click the Mecabricks (.dae), and instead clicked the regular Collada (.dae) button. When you installed the add-on, did you click the checkbox and "Save User Preferences"? If you don't, then you'll have to keep turning it back on every time you want to use it.

And don't worry about paying anyone to help you, there's lots of people on here that will be willing to help without any payment. 😃

Thank you very much, I'll try what you said 😃