How do you put a microsdhc card in a noble tablet

The device cannot be fixed.
Your information is another matter. Any book, music or app you bought will still exist in the account. Also, ANYTHING sent to the cloud will still be there.

All else you put on your Nook is gone unless there is a copy on a PC where it was originally.

If anything was transferred to a SD card, it is still there.

Your battery is failing.
Laptops have the same problem. Either replace the tablet (if it is still under warranty), get a new one, or tear it open to get a new battery.

If you get a new one, you can move all the non Barnes and Noble items onto your computer. Anything you bought from Barnes and Noble is stored under your account and password on their server.
Then, do a factory reset on your old one.

It is usually NOT WORTH IT to rip open a tablet to change the battery.

Your battery is failing.
Either replace the tablet (if still under warranty), or get a new one.
Save all that you can onto another computer, and move the stuff onto your new one. The Barnes and Noble items (ebooks and music) are saved under your account and password at the B&N site.

While it is possible to rip open the tablet to replace the battery, is not recommended. It is a difficult task that will damage the case.

Check your settings.

If it is a Barnes and Noble App that you are using, contact B&N tech support. Contact Customer Service

If the o.s. is android, open the application page, then "parameters" or settings, then in "personal" paragraph open "save and reset" (or so, my tablet is not in English). There you will find "factory reset" which erases all data.
It's easy. Good luck!

I think the phrase you are asking about is not "Reset" but rather "Root"

Root is the process of removing the restrictions from software. In this case, the Nook Tablet was designed with the Android OS, and then Barnes and Noble added their "software" on top of it, setting restrictions to the Android OS. an example would be, unable to visit the website Amazon.

Search the forums for XDA Developers as they are constantly updating their information. I have successfully "rooted" my Nook Tablet using an SD Card approach, and have had access to all the features of the internet as well as Google Play store.

Only reason I did it, my wife's games; Temple Run ($15 B&N, $1.99 GPlay)

Best Solution, sell it or return it, if possible, buy a Android only Tablet (Nexus, ASUS, Polaroid, Samsung, etc..)

This model tablet supports MicroSDHC memory card.

hold your power button and hold your home key both at the same time for 1 min