Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
You might well have a defective tablet. Do you have an option from the seller/vendor/store to return it if not satisfied, or a return-if-defective-for-exchange arrangement, that has not yet expired? (Such periods offered by vendors are usually quite short.)
But before deciding to try returning it to exchange for another... or, to give it over to RCA for under-warranty free repairs (which I can instruct you how to do in detail)... perhaps we should go into the problems and find out whether they are profound or merely little matters that are easily corrected.
What symptoms of not connecting to (wireless?) internet does it show?
How far do you get through registering your email? and are you configuring an email reading app (a way of reading your email etc.), or are you registering your email address in some other function e.g. registering your tablet with that email address?
With these details I will be able to advise you. Please let me know by Reply To Expert and I will advise you... this is just an initial inquiry for the facts of the problem(s).